Amtrack Promotional Sign

I was doing some video production work for Amtrak in Beech Grove Indiana. I noticed that inside one of the passenger cars they were referbishing they had dozens of posters promoting their different train lines hanging on the walls. The posters are approx. 5' long by 2-1/2' wide on 1/8th" hard plastic. They were stripping out all of the cars and simply throwing the posters in the trash. I asked if I could have one, and they gave one to me. I wish I would have taken more. I figure these would appeal to train enthusiasts as well as poster collectors. They aren't real old. But I am sure they are very hard to come by. Trying to figure out how to get my hands on a whole set of posters.