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 were evidenced by their service in mainline railroads, shortlines, and industrials.
Features:
- Scaled from actual prototype measurements
- 2 cab variations - riveted or welded
- Option for horizontal or vertical radiator shutters
- Fine scale handrails
- Separately-applied coupler cut levers, air hoses, piping, etc.
- Directional LED lighting (includes cab rear headlight)
- Die-cast hood & chassis for improved pulling performance
- Dual-flywheels for maximum performance at all speeds
- Factory-equipped with AccuMate® knuckle couplers
- Exceptional painting and printing
- Atlas Master® Gold version features ESU LokSound Decoder
DCC Operation Features :
- Supports all DCC-programming modes
- Flexible mapping of function keys F0 to F28.
- A total of 4 DCC function outputs are available
- Follows all NMRA DCC standards and recommended practices.
Sound Functionality Features (GOLD LOCOMOTIVES ONLY):
- Over 20 sound effects are available, including engine start-up and shutdown, prime mover sounds through all eight notches, bell, air horn, air compressor, dynamic brakes and more.
- There are 16 user-selectable horns, 2 user-selectable bells, and 2 user-selectable synchronized brake squeals.
- Manual and Automatic Notching modes with the ability to change modes ”on the fly” are provided for true realism.
