I had one years ago that seemed to struggle to pull it’s dummy so I sold them but I always liked it’s looks.
A little while ago I bought one and now have bought another, I like to double head they run smoother and great with two of them.
To me their really Railroad looking, I just wanted to comment.
I know what you mean i like the gp7 from that era also, i have a 8357 that i value alot, not a big puller but if it does not pull postwar car its not bad around for cars and caboose it also prefer if the cars have plastic wheels re-weight.