I sized my own waybills to fit the baseball-card-collector sleeves, and that size is 2.5 x 3.5 inches (same as a baseball card). I like the size and proportions, and have been happy with this design in my experience so far. But there are lots of modelers with a problem similar to Otis McGee’s, namely, that the layout already has design features oriented to the “mini-bill” or Old Line Graphics system, which is about 2 x 4 inches. Here’s an illustration of the problem:
This is Otis’s yard track filing arrangement for Dunsmuir yard (incidentally, most of the waybills visible here are the new ones, as shown in the previous post cited above for Otis’s layout). The same kind of problem exists at all the other switching locations on the layout, as in this example at Black Butte:
Here you can see a mixture of new and old waybills in the slots, and obviously a full rebuild of this fascia was not an attractive option.
There are other sizes and proportions of waybills being explored around the country, from a 4 x 4-inch document which folds vertically down the middle (like the prototype) and uses the same plastic sleeve as the 2 x 4-inch bills, to a larger bill which is about 4 x 6 inches and includes nearly all the prototype information. As with so many things in modeling, one has to choose what works best and feels best in his or her own situation.
In effect, what I’m emphasizing is that the waybill designs I’ve advocated are not restricted to a single format, size or proportion. The key idea is using the prototype waybill as a starting point, and retaining as much of it as feasible in model form. Size and proportions can be and have been adjusted to suit conditions.