The American Association of Railroads (AAR) Committee on Car Construction established a standard for 53' 6 flat cars based upon a 1941 Pullman-Standard Company design

Trainz Product Id: 11398430

The Trainz SKU for this item is P11446019

But even for the Roaring Twenties

Model Number: 116019

Plasticville 1951 Signal Bridge and Switch Tower Building Kit ProductID_12402116 The American Association of RailroadsThis is an easy to assemble, snap fit assembly, realistic detailing and no glue necessary kit. This is for use with all Lionel and other O Scale layouts. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Plasticville Model Number: 1951 MSRP: $27. 99 Scale Era: O Modern Model Type: Building Kits The Trainz SKU for this item is P11416431. Trainz Product Id: 11416431