For your consideration is this Marx M-10000 Union Pacific wind-up train set pair. There are two train sets in this collection, one is a four piece train and the other is a two piece train; both are expertly crafted with tin frame construction and both are wind-up trains. The Marx maker’s mark is shown on the bottom right-hand side of the train and both are marked with the identifying model number of 'M-10000'. This train is in good condition, with little wear to the tin and some scuff marks consistent with their age. The measurements of the individual locomotive are 3 1/2" x 10 1/2" x 3 1/2".