ALCO S-5

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ALCO S-5

Power type	Diesel-electric
Builder	ALCO
Serial number	80915–80921
Model	S-5 (Specification DL421A)
Build date	June 1954
Total production	7
AAR wheel arr.	B-B
Gauge	4 ft 8½ in (1,435 mm)
Prime mover	Alco 251
Cylinders	Straight 6
Power output	800 hp (600 kW)

The Alco S-5 (DL 421A) was a diesel-electric locomotive of the switcher type rated at 800 horsepower, that rode on two-axle trucks, having a B-B wheel arrangement.

This was Alco's first attempt to build a replacement 251-engined swithcer to replace the 539-engined S-3 and S-4. Only seven were sold, and Alco fitted the 251A engine in its replacement, the S-6 with power output raised by 100 horsepower (75 kW).

[edit] Original owners

Railroad	Quantity	Road numbers	Notes
Alco (demonstrator)	1	909	to Island Creek Fuel and Transportation Company #102
Boston and Maine Railroad	6	860–865

[edit] References

• Sarberenyi, Robert. Alco S5, S6, and SSB9 Original Owners.

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