More info Please.....Railroad name etx....Plenty of early 1950s engines such as C Liners and Alco FA1s, and E8s available. Not to mention RS series locos....I could go on!
Let me know what for and I'm sure I or plenty others could help!
Pick anyone of the older style locos (C Liner etc) and I can point you in the right direction and to what you should be paying for them. Which country are you in?
For your 40 and 50 era diesels Atlas,Kato,InterMoutain,Concor,
Life Like and many others makes them.
I am adding this link so you know what is avaible for the eras you mention.I am in no way connected to BLW but have dealt with them when I started my short trip back in N scale.I decided to stay with HO even though I still like N scale.