As some might have Read on G/O/S board, I pulled a bunch of old Lionel stuff out of my parent's attic. At the same time, I recovered small parts of my old Tyco Train sets, including a Santa Fe Warbonnet F-Unit, and one of the Bicentenial Engines. Both units had the trucks hanging down and missing parts, but the shells are still in good shape. Are there other, more reliable motors these shells will fit over? Both units are Tyco/Mantua. The F-Unit is an F9-A Santa Fe passenger: The Bicentennial looksa like this: This are 'like-new' pics, while mine are in much sadder shape.