A fellow member over at the Diesel Detailer's (see my sig for the DD) website has just put up a bunch of historical RR and industrial photos of the 50's -70's, many from Bethleham Steel up on his website. Check them out here: http://rudystrains.com/home.aspx Enjoy!
Jay
C-415 Build: https://imageshack.com/a/tShC/1
Other builds: https://imageshack.com/my/albums