cruise control for steady speeds regardless of curves

This is Williams 21830 O NS Heritage SD90 Lackawanna

The Trainz SKU for this item is P12157784

Model Number: 6-81254

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Bachmann 19461 N Reading 50' Sliding Door Box Car #19751 ProductID_11461787 cruise control for steady speedsThis is a Bachmann 19461 N Reading 50' Sliding Door Boxcar #19751. Features: All new tooling. Operating sliding doors, metal wheels, detailed underframe with separate brake rigging,and body mounted E Z Mate Mark II couplers. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Bachmann Model Number: 19461 Road Name: Reading (RDG) MSRP: $39. 00 Scale Era: N Scale Model Type: Freight Cars The Trainz SKU for