RRmods has alot of quality rollingstock, much of it can be used for 1980 on. JointedRail also has some great intermodal stuff, but it is mostly modern. As for years of use for the C30-7 I am not sure about ATSF but I know NS used them up until about 02-03. I think soom of the old ATSF and BN c30-7s made it into BNSF paint before retirement. Hope this helps.
Paul
Paul