Please see the attached link below. It was posted around 6 months ago and thought you guys would be interested in this. Sorry but I have no other way to contact you guys. The comments suggest that these are abandon Alco's RDC's and a Pullman or Bud Diesel...maybe contact the poster to locate the area these are. (hope its helpful)
https://www.youtube.com/watch?v=y-jzVjFpqjs