Here is a Lionel 6-12729 O Operating Mail Pickup Set from the early 1990s

This is a Pola 854 HO Town Gas Cylinder Building Kit

Power from transformer or track

40' Flat Car

The Trainz SKU for this item is P11440133

MTH 30-73489 O Nickel Plate Road RailKing 3-Dome Tank Car DwDetails-1.65-1.10-13.00-6.00-4.00-2 Here is a Lionel 6-12729This is an MTH 30 73489 O Nickel Plate Road RailKing 3 Dome Tank Car. Features: Intricately Detailed, Durable ABS Body, Colorful, Attractive Paint Scheme, Metal Wheels and Axles, Diecast 4 Wheel Trucks, Fast Angle Wheel Sets, Needle Point Axles, (2) Operating Diecast Metal Couplers, Detailed Brake Wheel, Separate Metal Handrails, Near Scale Proportions, Unit Measures: 10 1 4 x 2 3 8 x 3 9 16, Operates On O 27 Curves. Condition: Factory New (C 9)