Atlas HO 10005018  - Master - Silver - S-4 Diesel Locomotive "NdeM" #5524 

• Road Name: NdeM
• Road Number: 5524 
• Product Line: Master - Silver
• Scale: HO Scale
• Catalog: Atlas Winter 2025 Catalog

Features:

• 5-pole skewed armature motor for reliable operation
• Dual-flywheels for maximum performance at all speeds
• Exceptional painting and printing
• Sturdy die-cast mainframe and gear cases
• Metal couplers
• Silver Sound Ready

Atlas Master® Silver Series Additional Features:
• NMRA 21-pin plug for DCC (Decoder-ready)

***Silver Sound Ready™
Atlas Silver Sound Ready models are equipped with a speaker for easy conversion to
sound with the addition of a decoder. 

Overview:

Alco introduced the S-4 locomotive in 1950. The S-4, like the earlier S-2, was a 1000-horsepower switcher. Nearly 800 units were built for North American (Alco) and Canadian (by Alco’s Canadian subsidiary Montreal Locomotive Works) railroads between 1947 and 1956. The primary spotting difference between the S-2 and the S-4 can be noted in the trucks. The S-2 has Blunt trucks, while the S-4 has AAR-style trucks. The versatility of the S-2s and S-4’s was evidenced by their service in mainline railroads, shortlines, and industrial switching operations. The S-4, along with the S-2, became one of ALCO’s most successful diesel switchers, helping railroads transition from steam to diesel. Its rugged design and turbocharged engine made it a favorite for heavy switching duties. Canadian railroads were significant buyers, thanks to MLW production. Many units remained in service for decades, and several are preserved or still operating on short lines and tourist railroads today.