What timeframe are you thinking of? Many USRA gons were rebuilt or retired by the late thirties or early forties so there may not be quite so many choices if you are working to a later date.
One road that IM never offered as a kit was the Frisco. They had several thousand built to the same design during the twenties and many survived into the post war period, though there were detail variations between batches and many underwent rebuilding to a greater or lesser degree. The biggest changes were the use of dreadnaught ends on the last couple of batches and the rebuilding which added steel sides and side doors in various combinations.
You can use the Oddballs set for the version with side doors to cobble together enough decal an unrebuilt car.
Cars painted before 1943 were red oxide and those repainted later were black - Yesteryear models offered a RTR version in the latter scheme.
Another easy scheme is the old AB&C which can easily be cobbled together from data sets and Roman lettering. Be aware that this road was absorbed into the ACL in 1946 and the cars were very quickly retired, or rebuilt and re-lettered into the new owner's standard scheme.
Aidrian
-- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.3 - Release Date: 3/15/2005