yet operates comfortably on O-31 curves

it is mere coincidence

Here is a Lionel 6-38311 O Gauge 2276W Budd RDC Commuter Train Set

Model Number: 5933

The Trainz SKU for this item is P11461283

USA Trains 12102 G Southern Pacific Illuminated Caboose - Metal Wheels ProductID_11470237 yet operates comfortably on O-31This is a USA Trains 12102 G Southern Pacific Illuminated Caboose. Features include plastic latch couplers, plastic trucks, and metal wheels. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: USA Trains Model Number: 12102 Road Name: Southern Pacific (SP) MSRP: $151. 95 Scale Era: G Scale Model Type: Freight Cars The Trainz SKU for this item is P11418960. Trainz Product Id: 11418960