ALCO S-5

ALCO S-5

Infobox Locomotive
name=ALCO S-5
powertype=Diesel-electric
builder=ALCO
buildmodel=S-5 (Specification DL421 and DL421A)
builddate=June 1954
serialnumber=80915–80921
totalproduction=7
gauge=RailGauge|ussg|lk=on
aarwheels=B-B
primemover=Alco 251
cylindercount=Straight 6
poweroutput=convert|800|hp|abbr=on|lk=on
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 second attempt to build a replacement 251-engined swithcer 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 convert|100|hp.

Original owners

References

* Sarberenyi, Robert. " [http://users.inna.net/~jaydeet/s6.htm Alco S5, S6, and SSB9 Original Owners] ".


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