HO scale model of a Southern Pacific Cab-Forward locomotive from Broadway Limited Imports. Item Specifications: Manufacturer: Broadway Limited Imports (BLI) Road Name: Southern Pacific (SP) Road Number: 4106 Class: AC-4 (4-8-8-2 wheel configuration) Scale: HO Scale (1:87) Era: Steam Era MSRP: $499.99 Model Number/SKU: Typically 5187 (or similar within the Paragon series) Key Features: Control System: Paragon3 Sound/DC/DCC (operates on both DC and DCC layouts) Sound System: Authentic sounds featuring Rolling Thunder™ Smoke: Synchronized puffing smoke with variable intensity Construction: ABS plastic body with a heavy die-cast chassis Details: Separately applied handrails, ladders, whistle, and brass bell Operational Requirements: Minimum operating radius of 22 inches; compatible with Code 83 and 100 rail Couplers: Operating Kadee or compatible couplers These models were designed to accurately represent the early AC-4 class "Cab-Forwards" delivered to the Southern Pacific in the late 1920s to handle the fumes in long tunnels and snow sheds.