ALCO S-5

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**ALCO S-5**
Power type	Diesel-electric
Builder	ALCO
Serial number	80915–80921
Model	S-5 (Specification DL421 and DL421A)
Build date	June 1954
Total production	7
AAR wheel arr.	B-B
Gauge	4 ft 8+¹⁄₂ 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 (600 kW), that rode on two-axle trucks, having a B-B wheel arrangement.

This was Alco's second attempt to build a replacement 251-engined switcher to replace the 539-engined S-3 and S-4. Only seven were sold. The demonstrator unit was ALCO specification DL421 and the six production units were ALCO specification DL421A. Alco fitted the 251A engine in its replacement, the S-6 with power output raised by 100 horsepower (75 kW).

[edit] External links

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

[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

v • d • e Diesel-electric locomotives built by ALCO

Switchers	ALCO 300 • ALCO 600 • HH600 • HH660 • HH900 • HH1000 • S-1 • S-2 • S-3 • S-4 • DL420 • S-5 • S-6 • T-6 • SB-8/SSB-9

RS, RSC and RSD series	RS-1 • RS-2 • RS-3 • RS-11 • RS-27 • RS-32 • RS-36 • RSC-1 • RSC-2 • RSC-3 • RSD-1 • MRS-1 • RSD-4 • RSD-5 • RSD-7 • RSD-12 • RSD-15

Cab units	Rebel power car • DL-103b • DL-105 • DL-107 • DL-109 • DL-110 • DL-203 • FA • FB • PA • PB

Century series	C415 • C420 • C424 • C425 • C430 • C628 • C630 • C636 • C855

Diesel-hydraulics	DH643

List of ALCO diesel Locomotives

v • d • e Diesel-electric Switcher locomotives

Alco	ALCO 600 • HH600 • HH660 • HH900 • HH1000 • S-1 • S-2 • S-3 • S-4 • S-5 • S-6 • T-6 • SB-8/SSB-9

Baldwin	VO-660 • DS-4-4-660 • DS-4-4-750 • S-8 • RS-4-TC • VO-1000 • DS-4-4-1000 • S-12

Fairbanks-Morse	FM H-10-44 • FM H-12-44 • FM H-12-44TS • FM H-12-46

GE	60-ton boxcab • 100-ton boxcab • 600-hp centercab • 1000-hp centercab • DEY-2 • EN-6 • 25-ton • 35-ton • 43-ton • 44-ton • 45-ton • 50-ton • 60-ton • 65-ton • 70-ton • 80-ton • 95-ton • 100-ton • 110-ton • 125-ton • 126-ton • 128-ton • 1800-hp transfer • 2000-hp transfer • U5B • U6B

GM/EMD	SC, NC, NC1, NC2, T, NW1, NW1A, NW4, SW, NW2 • NW3 • NW5 • TR1 • SW1 • SW7 • SW8 • SW9 • SW600 • SW900 • SW1000 • SW1001 • SW1200 • SW1500 • SW1504 • MP15DC • MP15AC • MP15T • RS1325 • GMD1

Lima-Hamilton	Lima LS-750 • Lima LS-800 • Lima LS-1000 • Lima LS-1200