Here I am talking about replacing trucks on freight or passenger cars. Sometimes a car will have been supplied with the “wrong” trucks, say arch-bar when they should have been a newer design; sometimes the sideframes are really not up to snuff appearance-wise; and sometimes they roll, as a friend used to say, “like a rock down a gutter.” Replacing them is what I call re-trucking.
Some years ago, I posted an example of replacing trucks to get the correct prototypes, on the Red Caboose Southern Pacific HO scale stock cars. The models have very nice bodies, but were delivered with T-section trucks, an SP stock-car application for which I have found no prototype documentation or photograph. Instead, I replaced the Red Caboose truck with the truck SP actually used, the Vulcan, using the Kadee model. (See this earlier post: https://modelingthesp.blogspot.com/2015/07/modeling-sp-stock-cars.html .)
On the passenger side, I have sometimes replaced Rivarossi trucks with Central Valley trucks, with a gain both in car weight and in appearance. I described that as part of my long series on modeling SP passenger cars (for a description, see: https://modelingthesp.blogspot.com/2024/06/modeling-sp-passenger-cars-part-20.html ).
My second reason for re-trucking, poor appearance, includes such trucks as the snap-in AHM trucks. I showed my method for replacing them in an old post (see it at: https://modelingthesp.blogspot.com/2012/03/replacing-snap-in-trucks.html ). The photo below shows the kind of truck I replace immediately: its coupler, snap-in attachment, poor sideframes, and terrible wheelsets all disqualify this truck for operating use.
A common source of trucks that roll poorly is brass cars. A large proportion of sales of such models is to collectors, who often don’t care, or care much, about rolling quality. In my case, I do want to operate the models, so trucks often get replaced. This topic has come up before, as part of a larger grumble about the shortcomings of many brass cars (that post is here: https://modelingthesp.blogspot.com/2022/08/grumbling-again-about-brass-freight-cars.html ).
I don’t want to single out any particular importer or manufacturer of brass models, and the following example is just one recently encountered. I have a number of Challenger brass models of SP and PFE cars, and most roll just fine. But one of them, a model of Class R-40-26, is very much an exception. I had already had to replace all the side lettering (for why, see: https://modelingthesp.blogspot.com/2013/05/correcting-brass-model-of-pfe-car.html ).
Fiddling with the trucks didn’t result in any improvement. Most of the prototype PFE class had American Steel Foundries A-3 “Ride Control” trucks. These were the best-selling freight trucks after World War II and many manufacturers have produced them in HO scale. I chose a pair of such trucks from my stash.
To prepare the Challenger reefer, I drilled out the metric screw holes with a no. 50 drill, tapped 2-56, and attached new HO trucks with short 2-56 brass screws. These gave a stable rolling performance and were at the correct height for the Kadee couplers already installed.
I will look forward to seeing this car in service on the layout again, now that it has been successfully re-trucked. I regret the necessity of doing so, but it’s a job that unfortunately is all too familiar with brass HO rolling stock
Tony Thompson





























