Hi Jeff, I’m not really sure what the building is. I bought it used at a hobby store. It is actually an HO structure but I installed O gauge doors to repurpose it. Just a note, I have many Morton closed hoppers, as well as Morton boxcars that the running train that runs through this area pulls. Your info. is well received though. I guess I’ll just say the open ore cars are for underground transport only. Sound ok? Thanks.