It can be adjusted for track radius

This is a Model Power 2231 HO Scale White Rock Water 41' Metal Reefer #55075

This is a Life Like 1659 HO Scene Master Flat Car Load Power Generators (Set of 2)

plastic wheels with metal axles and a detailed underframe

MTH 20-67249 Chessie 70' ABS Full Vista Dome Passenger Car ProductID_12191085 It can be adjusted forProduct Features: Durable ABS Intricately Detailed Bodies Metal Wheels and Axles Overhead Interior Lighting Diecast 6 Wheel Trucks 10 Passenger Figures In Each Coach Car Operating Diecast Metal Couplers Colorful, Attractive Paint Schemes End of Car Diaphragms Separate Metal Handrails Fast Angle Wheel Sets Needle Point Axles Detailed Car Interiors 1: 48 Scale Dimensions Detailed Car Undercarriage Unit Measures: 19 x 2 7 16 x 3 1 2 Operates On O 42