Sunday, May 1, 2016

Trucks and snubbers, Part 3

In the first post in this series, I described truck spring arrangements, and some simple snubber designs (you can read it at the following link: http://modelingthesp.blogspot.com/2016/04/trucks-truck-springs-and-snubbers.html ). The subsequent post described a variety of trucks with leaf or elliptical springs, substituted for the usual coil (helical) springs, as another method to accomplish some snubbing action (it’s at this link: http://modelingthesp.blogspot.com/2016/04/truck-springs-and-snubbers-part-2.html ), through the friction among the individual leaves in the spring.
     But also in the 1930s, more compact and simpler ways to provide frictional snubbing were also being developed. The first one, and very influential, was the Barber stabilizer design (named for its inventor, John C. Barber), first produced by the Standard Car Truck Company but soon licensed by almost all other truck manufacturers. Thus the term “Barber stabilized” truck” does not designate a truck manufacturer, it only indicates the licensed snubbing design. The drawing below, from Railway Mechanical Engineer, December 1938, shows the operating principle. The sliding wedge, highlighted in red, was forced against the vertical wear plate to create friction whenever the bolster moved up and down.


The auxiliary springs (called out in the drawing as “special side springs”) which maintained pressure on the friction wedges were located behind the main springs and thus ordinarily invisible from trackside. But the distinctive pockets in the bolster end, in which the wedges were housed, are an easy spotting feature for Barber trucks, as in this example. This S-2 truck has a spring plank.


The photo is from the Richard Hendrickson collection.
     In subsequent years, most other truck manufacturers would develop their own versions of this bolster snubbing capability, marketed under such trade names as “Cushion Ride” and “Snub-Up.” The most successful of these was the “Ride Control” design by American Steel Foundries, designated the A-3 design, which along with the Barber S-2, were by far the most popular trucks of the transition era, and sideframes of both types are being produced today in 100-ton roller-bearing versions. Below is a photo of a transition-era ASF-A-3, produced for B&O, as indicated by those initials cast onto the sideframe (photo by ACF Industries, courtesy Edward Kaminski).


In this truck, you can see there are five spring pairs, not the usual four in a 50-ton truck, and that is because the springs which exert pressure on the friction wedges are inside the outer two main coil springs.
     Even more exotic truck designs were created to provide snubbing in other ways. One interesting example, which did sell in small quantities, was the Chrysler truck, using beefed-up automotive shock absorbers to absorb vertical motions. This truck, named FRD-5, looked like this (photo from the manufacturer), and had sideframes cast by Symington-Gould. The shock absorber is at the right, with a coil spring at left, in the spring opening.


I described a modeling approach to this truck in a prior post, about a PFE car group which had them. If you’s like to see it, here is the link: http://modelingthesp.blogspot.com/2016/02/pfes-40-foot-express-reefers.html .
     We have good model versions of most of these trucks (a glaring exception is the Barber truck shown earlier in this post, which we need in a postwar version without a spring plank). But many model equivalents of the trucks shown in both these posts are provided in Richard Hendrickson’s summary, available from this link: http://modelingthesp.blogspot.com/2013/07/another-update-to-richard-hendricksons.html .
Tony Thompson

Thursday, April 28, 2016

Truck springs and snubbers, Part 2

My first discussion of trucks and how they are sprung, included description of some ways in which snubbing by friction was introduced into freight car trucks (see it at: http://modelingthesp.blogspot.com/2016/04/trucks-truck-springs-and-snubbers.html ). The spring-substitute snubbers shown in that previous post were not the only early approach to adding some frictional energy absorption to trucks.
     Another method, recognized quite early, was to accomplish some of the springing with leaf springs (usually called elliptical springs, as opposed to helical or coil springs, based on their shape). A leaf spring package is readily introduced into a truck sideframe, and in fact this had been done as early as the turn of the 20th century, for caboose trucks. At the time, arch-bar trucks were superseding older caboose trucks derived from passenger designs, that had longer wheelbases and wooden truck beams.
     Progressive railroads were beginning to adopt cast-steel sideframes for trucks, and below is a single example, from a 1913 Southern Pacific caboose, with an early-style Andrews truck. It has an L-section sideframe and a long bottom tie-bar, in contrast to the familiar USRA-era Andrews truck with two short horizontal tie bars. (Detail from an SP photo of caboose Class CA.)


When compressed and released, an elliptical spring experiences relative motion between each adjoining leaf in the spring, That motion occurs with considerable friction, and thus accomplishes a kind of snubbing.
     A wide variety of caboose trucks (and sometimes freight car trucks) were built with leaf springs only. The Bob Karig photo below shows an example, in a Delaware & Lackawanna Western truck. This Gould truck with relatively modern double-truss cast-steel sideframes was produced in 1948.


     Freight car trucks were first modified with added elliptical springs in the early 1920s, simply substituting them for a pair of helical springs. An example below is a Pennsylvania 2D-F8 truck arranged that way. This truck is easily recognized by the “bulged” portion of the sideframe under the spring opening. (This truck is an outgrowth of the ARA “Type Y” truck, adopted a year earlier as Recommended Practice, though the two are not identical.)


     A 70-ton truck, usually with three spring pairs visible at the sideframe, could receive the elliptical spring set in the sideframe center, as seen below. Near the right end of the truck, the characters “6 x 11” are cast onto the frame, indicating 6 x 11 inch journals, the standard size for 70-ton nominal capacity. Note that you can see all the way through the hollow bolster. (You can click to enlarge.) Both this and the preceding photo are from the Richard Hendrickson collection.


     An even more ambitious attempt to incorporate a major role for elliptical springs in a freight truck was the Simplex truck of the mid 1930s. One is shown below. Among the buyers which tried out this truck (and kept it in service for a number of years) was Pacific Fruit Express, whose photo this is.

Obviously both coil and leaf springs were cushioning the bolster here. This truck was never widely used. Reports were that although it did ride very smoothly and performed well at high speeds, it was significantly more expensive.
     But even as these kinds of elliptical spring snubbing systems were developed, along with the frictional-wedge kind described in the Part 1 post in this series, more compact and simpler ways to provide frictional snubbing were also being developed. I will return to those in a future post.
     I will also include here, for those interested in even more information about these matters, a couple of very complete and authoritative references on freight car trucks.

Richard H. Hendrickson, “Freight Car Trucks,” Railway Prototype 
     Cyclopedia, Vol. 4, 2000, pp. 35–51.
Richard H. Hendrickson, “Freight Car Trucks, 1900–1960,” Model Railroad
     Hobbyist, May 2013 (download free from their site).
Martin Robert Karig, Coal Cars (Chapter 6: trucks), University of Scranton
     Press, Scranton, PA, 2007.

     There are adequate model versions available commercially of a couple of different truck designs with elliptical spring groups substituted for a helical spring pair. It is also quite possible to “truck bash” one for yourself, using one of the many express or passenger trucks with leaf springs: just cut off the leaf spring protrusion and and glue it in place over a coil on your coil-spring truck. But rather than discuss model trucks here, I would instead recommend the excellent illustrated description of HO scale trucks provided in Richard Hendrickson’s article, available at Google Drive from this link: http://modelingthesp.blogspot.com/2013/07/another-update-to-richard-hendricksons.html .
Tony Thompson

Monday, April 25, 2016

Upgrading a simple freight car kit

I received an interesting challenge in an email a few months ago, and the idea has been rattling around in the back of my mind ever since. The writer said that it was all very well for me to describe projects with resin cars or extensive modifications to other kits, but how about if I were to take something really simple (he mentioned Accurail) and build it with some upgrades? That’s a blog post he would enjoy reading, he said. So I finally decided to shut up those rattling sounds in the back of my mind, and took a look at my stash of kits.
     I had an Accurail kit for one of their steel refrigerator cars with a sliding (plug) door, which happens to have been decorated by 5th Avenue Car Shops for National Car Company. (You can see the 5th Ave. line at this link: http://www.accurail.com/accurail/art/custom/carshops/carshops.htm .) That sounded like a good prospect for this job. The box end is all the info I have about this decorated kit (the rest of the box lid is standard Accurail graphics).


     With any freight car, I start with the roof. Most model layouts give us an overhead view of the freight cars, and mine is no exception, so the roof really needs to look good. The Accurail car has a molded styrene running board, not a terrible representation of a steel grid, but hardly in the appearance league of an etched metal board. Moreover, the roof has no corner grab irons, so I decided to add those too, using TIchy no. 3028 irons and Detail Associates eye bolts (part SY 2206). But omitting the kit running board leaves holes in the roof. I fill these with the attachment pins of the kit running board, seen here prior to touching up with silver paint. I also painted the roof corner grabs at this time, as they too have to be silver.


     The kit includes a full-length metal weight, which has just the right amount of weight, but can interfere with screws used to attach trucks or coupler boxes. (I greatly dislike the Accurail peg attachment for trucks, which seems to either be too frictional, restricting truck rotation, or gets loose and falls out. Either result is not okay.) But if I shorten the weight to clear bolster screw locations, I would eliminate some weight. Answer? Shorten it, then glue the removed part on top (I use canopy glue for this, excellent for dissimilar materials).


You can see a little excess glue here, but it will of course be inside the car.
     Before going further, I should emphasize that although I am modifying or upgrading some aspects of this kit, its overall quality is really very high. Like almost all Accurail products, the parts are superbly engineered and go together beautifully. Some prototype details may be simplified or omitted, but the overall dimensions and appearance are excellent. My project here is go beyond that and improve the model even further.
     I mentioned the addition of corner grab irons on the roof. I also decided to add wire grab irons at the left of each car side. The molded-on side grab irons are easily removed with a chisel-blade hobby knife, and holes drilled for new parts (I use Westerfield grab irons, part no. 1198). They were touched up with Reefer Yellow. The etched-metal running board I used as a replacement for the kit part is from Plano (their no. 197), and the set also includes an etched metal brake step, which I also installed. Both these metal grid parts were attached with canopy glue.
     Another area of concern with any kit like this is the sill steps. I want them to be reasonably durable, reasonably prototypical in cross-section, and correct in appearance. This kit provides a wide, double-rung step for the location under the car door. The prototype, however, did not have those, as can be seen below. The photo shows a simpler, narrower step under the door. I modeled this with an A-Line Style A step. (You can click to enlarge.)


     The photo above was provided by Fruit Growers Express expert Bill Welch, and shows the first car, MNX 1915, of 100 cars built in 1952 by Fruit Growers for their subsidiary, National Car Company, and numbered 1915–2014. These were, incidentally, meat cars, equipped with meat rails and classed as AAR RSM type.
     The photo above shows black door hardware, ladders and grab irons, but only this car was so painted, for the builder photo. Photos of cars built the previous year, and of other cars in the 1915–2014 group, show all this hardware as body color, which is how the model is decorated. Here’s a 1951 MNX photo that shows the yellow hardware, courtesy of Bill Welch.


     With detail parts installed or upgraded, I installed my standard couplers, Kadee “scale head” size, in this case the no. 158 whisker couplers, and Reboxx wheelsets with 0.088-inch-wide treads, in the Accurail truck frames. I have summarized my freight car standards in a previous post (you can see that post at: http://modelingthesp.blogspot.com/2011/03/model-freight-car-standards.html ).
     The completed car was lightly weathered (it would be only a year old in my modeling year), primarily in making the light-colored roof look grimy, and looked like the photo below. You can just see the replacement step under the door.


     This car will form an addition to my fleet of meat cars, which bring packing house products (PHP) to the wholesale grocer on my layout.
Tony Thompson

Friday, April 22, 2016

Trucks, truck springs, and snubbers

I have chatted a number of times, over the years, with modelers who have little or no idea how freight car trucks are sprung, nor how the truck mechanism works. And without understanding springing, either spring snubbers or bolster snubbers make little sense. In this post I will try to clarify these matters a little.
     First, the springs. As modelers, we often think of freight car trucks of the 50-ton size as having two springs, which we can see from the outside of a prototype truck. And, after all, model trucks with “working” or “real”  springs have just two springs. Here is a representative example of such a “real springs” model truck, which happens to be Kadee but looks like many others of the same type.


To their credit, Kadee is steadily replacing trucks of the above design, with new, solid sideframes.
     But real truck springs are not like this. In fact, what looks like one spring nearly always consists of two springs, one inside the other. The photo below (from Union Spring) shows such a pair of springs; note that one is right-handed and one-left handed. There is no way one can see through such springs, as one can do with the model truck shown above.


My late friend Richard Hendrickson experimented with putting a styrene piece behind the springs in “sprung” model trucks, so that you couldn’t see through them, but admitted it was a fussy job. It’s much easier to purchase solid sideframes in the first place. Moreover, one experimenter found that an HO scale freight car had to weigh half a pound before the springs in “sprung” trucks did anything, so they are not contributing to better tracking of any but the heaviest model freight cars.
     A further complication in prototype trucks is that a typical 50-ton truck has either four or five springs, not two, and moreover each of them is the kind of pair shown above. Since the 1920s, springs have often been assembled into “spring groups,” as they are called. Here is a Cyclopedia photo clearly showing what a spring group looks like, assembled with spring plates top and bottom, and you can see a spring pair at each corner, and one in the center, five in all. You really can’t see through a group like this.


This happens to be a truck manufactured by Bettendorf, though as many modelers now know, that company ceased production of freight car trucks in 1942, and even when active, produced only a fraction of all freight car trucks. Thus using “Bettendorf” as a generic term for trucks with cast steel sideframes is broadly incorrect, and historically inaccurate after 1942.
     By the late 1920s, railroad mechanical people had become aware of the fact that the truck springs then in use gave a relatively hard ride. This was easily improved with longer and softer springs, but then the truck, and the car which rode on it, was prone to harmonic vertical oscillations at certain speeds, leading to severe “bounce” and possible damage to both lading and car. The problem is that a spring readily absorbs energy when compressed, but when the compression force is removed, equally readily releases that energy back in the opposite direction.
     This kind of problem with spring behavior had already been recognized and solved with draft gear, where the answer lay in adding mechanical elements which absorbed energy as friction, and then released much less or even none of it, when the original movement force was removed. The same was soon tried with truck springs, in a variety of designs, from practically every company that made truck parts. One easily understood example is the early Simplex design, shown below. Load application was vertical, and the inclined wedge surfaces were the frictional elements. A steel spring is in the center, and transverse springing is accomplished with rubber blocks at each side.


Below is shown one of these Simplex snubbers in place in a 40-ton truck (both photos from PFE).


This general idea, to offer a snubber to the market which could simply be substituted for one truck spring in a spring group, was widely used. Here are two other examples of commercially available snubbers of this type (both photos from the manufacturers). At left is the Miner C-2-XB and at right is the American Steel Foundries (ASF) version of the Simplex design.


Note that a snubber positioned in the center of a spring group, as the Miner is shown above, would be difficult to see in a prototype photo. But often the snubber replaced an outer spring. Shown below is the ASF snubber, installed in a Dalman-Andrews truck (Jack Burgess photo, Richard Hendrickson collection).


For existing trucks, no other method of improving ride was so inexpensive and easy to install.
     To my knowledge, we don’t have, in any scale, a model truck with a snubber represented of the kinds shown here, though many thousands of them were sold and installed in the 1930s, and remained in service into the 1950s. But by 1940, a different solution was emerging, and after World War II, would dominant good-riding truck design. I will discuss it in a following post.
Tony Thompson

Tuesday, April 19, 2016

Truck and wheelset modeling

In a previous post about my new shop track alongside the roundhouse at the town of Shumala on my layout, I mentioned the installation of a wheel track, as a radial track coming off the turntable. (You can read that post at the following link: http://modelingthesp.blogspot.com/2016/03/a-shop-track-for-shumala.html .) This present post is about modeling what goes there.
     I will begin with prototype wheelsets. Many modelers seem not to realize that the end of a railroad axle is the surface on which bearings ride, and is called a “journal.” (This is why both roller bearings and solid bearings are properly termed “journal bearings,” because they ride on the axle journal.) The photo below (from the National Malleable and Steel Castings Co.) shows a wheelset being removed from a truck, and the journal at the near end of the closest axle is evident.


     Prior to entering service, a newly mated pair of wheels and an axle are machined,  to achieve exact journal dimensions. If necessary, the wheel tread may also be machined to correctly contour the tread and flange. Freshly completed wheelsets sometimes have axles or wheel faces painted, as in this contemporary view.


     Our model wheelsets, of course, almost always have axles with pointed ends, intended to operate with only the point in contact within a conical hole in the sideframe. But the axle ends on this kind of wheelset do not look much like the prototype. Without naming any sources, compare the axle ends of this model wheelset with what you see in the photos above:


Also note that although the tapered center of the model axle here looks good, the prototype photos above all show an almost invisible taper for axles. Prototype drawings for axles, which show a rather gentle taper, can be seen in any volume of the Car Builders’s Cyclopedia over many years.
     The foregoing photos should suffice to demonstrate why modelers should not employ most model wheelsets as scenery, because of the pointed ends on our model axles. Instead, there is an easy solution already available: the Tichy package of wheelsets used with their flat car (converted to a wheel car). The wheelsets alone are available from Tichy as set 3004, eight axles and eight pairs of wheels, which can be assembled or used separately as stored parts. Here is the same model wheelset shown above, with its pointed axle ends, alongside one of the Tichy wheelsets. Note the difference in axle taper, and in wheel tread width also.


The “standard” model wheel tread in HO scale has had a width of 0.110 inches for many years, and that is the tread width of the pointy-ended wheelset shown above. What we now call “semi-scale” wheel treads are 0.088 inches wide. Prototype freight wheels have a rim thickness of 5-23/32 inches, which is 0.066 inches in HO scale. The Tichy wheels shown above are 0.066 inches wide, and though many modelers immediately say, upon seeing one, “it’s way too narrow,” in fact it is an accurate prototype wheel width.
     Another point about the photo of the Tichy wheelset is the journal. What’s critical for using these parts as models is that nearly all prototype wheelsets have a bright, metallic surface on the machined journal, with a rusty color on everything else. The Tichy set comes entirely in a good brownish-red color. I masked the axle centers and painted them Gloss Aluminum, Tamiya color  TS-17, and then touched up the axle centers as well as the wheels with Burnt Siena and related acrylic colors to produce a realistic look. That’s what you see above.
     With these points in mind, I have made up several wheelsets for my wheel track at Shumala. I am not stopping there, because I want to show a truck being worked on, but for now, these Tichy wheelsets show the kind of look I think we need to model when we show these items as scenery.


These wheelsets are not completed, because the color needs more work; this reddish color is the as-molded color as it comes from Tichy, but I want to get a browner shade on these wheelsets. Still, you can see the general appearance that will be created. Note that wheel treads are not shiny, indicating that these are new wheels, not yet in service.
     I will comment further about wheelsets and truck modeling in a future post.
Tony Thompson

Saturday, April 16, 2016

Electrical wars, Part 8

I am definitely among those who don’t find layout wiring to be their favorite part of the hobby. But it is, of course, utterly essential. So I cope with it, perhaps revealing my lack of enthusiasm in this series of posts entitled “electrical wars” (you can find the preceding posts in the series — and related posts — by using the search box to the right of this text, and entering "electrical wars" as your search term).
     A tool which I really created as a kind of obligation for completeness, but which has proven even more valuable that I ever imagined, is my Layout Notebook. It includes benchwork basics, some scenery procedures, planning ideas, and even thoughts about structures, but the core of its usefulness is the electrical sections. I said a little about it in a prior post (which is at: http://modelingthesp.blogspot.com/2012/08/a-modeling-journal.html ), though that post was mostly about the successor Modeling Journal, for everything other than the layout wiring.
     The present post is occasioned by my cutover from plug-in DCC throttles, the previous arrangement, to radio throttles (as I described previously, in this post: http://modelingthesp.blogspot.com/2016/03/changing-throttle-connections.html ). Let me quickly say that the change from plug-in to radio throttles was, in and of itself, very quick and easy. The NCE technology works smoothly for this changeover. The only “electrical war” part of the project was re-examining all my layout feeders, to make sure I had two distinct and separate geographical districts in the new arrangement, specifically that all power connections to the outer end of my mythical SP branch line (the towns of Ballard and Santa Rosalia) were separated from those to the rest of the layout.
     Two districts aren’t vital to radio throttles, just something that I decided to implement. So this post is about my use of the Layout Notebook for information, not about any difficulty with the change to radio. But though I trust the Notebook, I hate to assume anything I could check, so I climbed under the layout in several places to examine the various feeders and terminal strips with a fresh eye. (Of course, there is plenty of “stuff” stored under the layout, so various parts of the “stuff” had to be pulled out to permit access, then put back into place.) Here is a photo from underneath the east end of Ballard:


     You can see in this photo the feeder B-FE-N (it looks double, but the second image is the shadow of the wire), terminal strip 54T (so named because it is the “starting point” for Cable 54, which you see at lower right), and another cable connection, plus wires feeding other terminal strips. This was a good thing to see, because Cable 54 brings the DCC power from the command station to 54T and the cable below it, 53B, connects to all other Ballard feeders (the green and white wires in both cables are unused at this point). That meant that all Ballard and Santa Rosalia feeders were already separated from the rest of the layout, and could readily be connected as a separate district.
     Incidentally, I wanted to mention something I have been doing for some time, but it seems many haven’t thought of it. I use a headlamp when working on wiring under the layout. I had an old one from my backpacking days, and with fresh batteries, it was good to go. These devices, of course, are excellent at putting a beam of light right where you’re looking. I do use a conventional hanging “trouble light” also, but moving it around all the time can get inconvenient. Especially when just checking connections at terminal strips, as I was doing for the project described in this post, the headlamp was excellent.
     Once the new NCE command station was installed, and the EB3 circuit breaker board installed, I could crawl under the layout at Shumala and take a photo like the one below. Yeah, wires everywhere, but at least they are labeled and I know what they are. Obviously I’m not among those who say “I’ll never even take a photo underneath my layout, never mind ever show it to anyone.” In fact, I kind of like photos that reflect reality, like this one:


     Once again, having a well-maintained Layout Notebook with up-to-date identity of electrical connections and cables proved invaluable. I’m glad to have this piece of electrical work behind me, and will definitely continue to make sure the electrical information in my Notebook is kept current.
Tony Thompson

Wednesday, April 13, 2016

Building Willow Lake Road

As I showed in a prior post about the trackwork in my layout town of Santa Rosalia, the end of my mythical SP branch line, the road which passes the depot is Willow Lake Road (see the location and the template for this road at this link: http://modelingthesp.blogspot.com/2016/03/the-branch-end-at-santa-rosalia.html ). In the present post, I will show the construction of this road using styrene sheet, as I have done previously, and been happy with the result (see: http://modelingthesp.blogspot.com/2015/07/extending-bromela-road.html ).
     Some time back, I bought a large sheet of 1/16-inch thick styrene, and have been using it for a variety of projects calling for large pieces of material. That’s the material I used for Bromela Road (see link at the bottom of the previous paragraph) and is intended for this road project as well. Using the paper templates shown in the post linked near the top of this post, I cut the three pieces of styrene roadway, using a utility knife. Shown below are these pieces, so far just laid in place to check the fit.


Just beyond the end of the styrene strip in the middle distance, you can see where I had to cut away some of the slope built up alongside the harbor edge, to clear the road. The unpainted rectangle to the left of the road is the footprint of the Santa Rosalia depot.
     I primed the styrene with ModelMaster gray primer, then “glued” it down with taxidermist’s paper mache (the Brandt’s Compound mentioned in a previous post: http://modelingthesp.blogspot.com/2012/11/the-shumala-extension.html ), while blending the sides of the roadway with the same paper mache.This is much like the process I used in extending Bromela Road in Ballard (I described the formation of road shoulders in the post cited earlier, at: http://modelingthesp.blogspot.com/2015/07/extending-bromela-road.html ).
     Once the glue-down function and blended roadsides had dried sufficiently (I usually try to leave it overnight), it looked like the photo below.


A few rough spots have been sanded, but for the most part, whatever contours result from the application process will look all right.
     Once the paper mache was fully dry, I painted the shoulder areas with my usual “ground” color, Rust-Oleum Nutmeg, and then painted the road surface with Rust-Oleum Gray Primer. Though the road surface needs weathering and a little warmer color, which I will do with tube acrylics, the photo below shows the area after these additions of Rust-Oleum colors. The offshore fog bank still needs some refinement.


Note above that the road painting does not extend quite to the backdrop. There will be strategic shrubbery placement in the completed scene, so that the road-backdrop intersection will not be visible. That intersection is also obscured by the depot, when it is in place, as you see below, from a  more normal viewing elevation. A tractor-trailer is posed on the road.


     Pending weathering, installation of Willow Lake Road is complete. I also need to add the side street alongside the industries in Santa Rosalia, Laguna Street, but will wait until the industry spur and structures have been located before fitting that street into the scene.
Tony Thompson