Be very careful with train tracks- what you think may be inactive may not really be. Also, most train tracks are private property.
Having said that, if you have access to an industrial park (you never said where you were!), often times (especially in the 50's and 60's), factories were built right next to train tracks to facilitate getting products and materials into/out of the factory. With the building up of the road system and truck transportation becoming much less expensive, alot of those train tracks were abandoned and make an excellent part of photographs, either as background or subject.
Years ago I shot some rock band promo shots on some train tracks, in B&W, and they came out excellent. Overgrown weeds and some abandoned equipment really gave the pictures that old, tough look, especially with no color.
So see if you can find some tracks in back of a factory- even if it is fenced in, the tracks have to come out from the fenced in area eventually.
As far as an old truck, see if you can find one sitting around a body shop where they repair vehicles. They often have future projects, or parts vehicles, sitting off to the side of the building. And there's always a junk yard if you're desparate. You'll definitely have to ask permission in those places, though.