Anathemaactually hit a local university and check with their departments of architecture and engineering. they have student's doing random projects all the time with things like that kicking around. guarantee you can find large scraps of rail-like metals and piping kicking around. we did that years ago for a rail jam and they actually had a flat rail in one of their facilities that they just let us use. might be worth a shot to shoot out a few emails. how about a local trade college?
Very good advice, we did steel bridge competition and every year we would order new materials and throw out our old bridge and its scraps. Would be great material for building rails.