by Giuseppe » Sun Nov 11, 2012 11:17 pm
Ooh, those are some nice pictures, although unfortunately they don't appear to represent the requested prototype; they appear to represent an ASF "Ride Control" truck rather than a Barber S-2. (Come to think of it, I think that truck might even be of an older 70-ton variety rather than the 100-ton variety used under most modern railcars. The 70-ton trucks can be spotted under boxcars and--I think--autoracks, which require a smaller wheel size due to height limitations.) While the two designs have been around for a while and evolved significantly, the primary spotting feature has remained basically unchanged: the "Ride Control" has a rather bulbous and more substantial "spring seat," for lack of a better word, than that of the S-2. It's also worth noting that there are multiple designs representing the S-2 brand, each manufactured by a different foundry, solely for the 100-ton roller-bearing variety.
Thanks,
Eliot