The 1870's .How about nicely detailed models of those truss rod flat cars maybe 36' with the two wooden (look like wash tubs) on them for water service. Oh my bad again,the 1970"s .That was during my Hippy Period and I was doing alot of stuff and was not paying attention to specific freight cars. "Now wait just a gosh darn minute.""Do you really want to admit that?"Ok then how about 70's era gon's. Nate Goodman (Nato).