The extra pair of drivers permitted the construction of a bigger boiler and firebox

Model Number: 70-2080-4

Automatic Bumper Reverse Mechanism (ABRM)

Here is a Lionel 6-9111 O Gauge Norfolk and Western 4-Bay Hopper

Acme O Scale Scrap Gondola Load Lightweight for Lionel or Atlas ProductID_12526090 The extra pair of driversThis is a Acme O Scale Scrap Gondola Load Lightweight Polyurethane Foam Weathered and Painted Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Acme MSRP: $19. 99 Scale Era: O Modern Model Type: Freight Cars The Trainz SKU for this item is P12564482. Trainz Product Id: 12564482