According to Micro-Trains, the prototype for their generic "roller bearing truck" is a Symington-Gould 70-ton Ride Control truck (built in the early 1950s). Given the relatively arcane and lightweight design, it's likely that most of these trucks were retired from service by the 1980s. However, some can indeed be found on the rails today (on MOW tank cars and suchlike).
Intermountain makes a friction bearing truck (for their GPEX milk cars) that, if not based on a Symington-Gould design, is at least Symington-Gouldesque. Trucks like these were used on high speed freight cars starting in the late 1930s -
