Based on the earlier Star Class locomotive

Put them on your standard O gondola to simulate that they are really carrying steel coils inside

This is Lionel 6-81015 O B&M Reefer

Trainz Product Id: 12399039

and a Pennsylvania Railroad caboose as well

MTH 30-77253 O Great Northern Woodside Caboose VariantsUnitPrice_number_22.85 Based on the earlier StarThis is a MTH 30 77253 O GN Woodside Caboose. Intricately Detailed Durable ABS Body, Stamped Metal Floors, Metal Wheels and Axles, Diecast 4 Wheel Trucks, Fast Angle Wheel Sets, Needle Point Axles, Operating Diecast Metal Couplers, Operating Interior Lighting, Near Scale Proportions, Unit Measures: 10 x 2 3 4 x 4, Operates On O 27 Curves. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: MTH Model