I was at the GAT Show at the Orange County Fairground yesterday. I picked up two shells one was either a S1 or S2, the other is a Rs1. The "S" is an old "Model Power" I think, the Rs1 is an old "Lifelike" toy. I plan to use an old Athearn Sw7 for the walkways and chassis. It will probably be repowered by a can motor.