There's a rather larger number of various green/blue SSA scrap metal wagons: 33-430, 33-431, 33-431A, 33-434, 33-435, 33-436 to name a few.
Besides 435 being weathered and 431A a slightly different design what is the difference? What I'm really asking is: are they all of the same tooling quality? Or, like the Class 37 loco, is there an earlier tooling which is inferior to a later release?