Real or fake? copper train set

This was my grandfathers train. When he passed away they had a auction and sold everything. This was one of the items I wanted bad. I know there were collectors there that wanted it. When they picked up the train to sell it I was trembling and in tears. I through out a crazy number. I heard people in the background asking if I was family. No one bid against me. The train is a Pennsylvania Limited Belmont 406 and Woodbine 407. The locomotive has the number 50 and the coal car also has 50 on it. There are no other markings. Belmont has a crack in the top of it. It looks like it is made of copper or maybe brass. I don't know if it's real or re pop. I'm guessing some sort of re pop.