found this train set...

[trevorharm]

so i found this train set in the house i recently moved into... I dont know anything about trains or train sets, but am curious as to what i have. its a Bachmann HO, old west overland freight. Item number 1860. The train itself is 6 pieces, 4-4-0 loco, old west pass car, freight car, water tanker(3), and 2 other cars that are not identified. 1 car appears to be a livestock car(?), and the other is like a flatbed, with red rails.

Thanks for reading my post, and i appreciate any help!