Description
Alco introduced the S-4 in 1950. The S-4 like the earlier S-2 was a 1000 horsepower switcher. Some 636 S-4’s were built for North American railroads. The primary quick spotting difference between the S-1/S-2 and the S-3/S-4 can be seen in the trucks. The S-1/S-2 has Blunt trucks, while the S-3/S-4 has AAR-style trucks. The versatility of the S-2’s and S-4’s was evidenced by their service in mainline railroads, shortlines,
and industrials.
Features Include:
- Newly tooled with improved cab design
- 5-pole skewed armature motor for reliable operation
- Dual-flywheels for maximum performance at all speeds
- Factory-equipped with AccuMate® knuckle couplers
- Exceptional painting and printing
- Sturdy die-cast mainframe and gear cases
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