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File:1280px-Montreal power backup.jpg

The ALCO 251 is a prime mover that was designed and built by the American Locomotive Company (ALCO) to specifically replace its 244 and 539 engines. The ALCO 251 diesel engine was developed to be used in diesel locomotives that ALCO had manufactured.

North American locomotive uses:[]

Engine type Power (hp) Locomotive(s)
inline-6 251A 800 S-5, GE 78 Ton, GE X3341.
inline-6 251B 900 S-6.
inline-6 251B 1000 T-6.
inline-6 251C 1000 S-13, RS-23.
inline-6 251D 1200 DL535E.
V-8 251F 1500 C415.
V-12 251B 1800 RS-11, RSD-12, RS-18, RS-36, FPA-4, FPB-4.
V-12 251C 2000 RS-32, C420, DH643, M420.
V-12 251E 2400 M424, HR412.
V-16 251B 2400 RS-27, RSD-15, RSD-17, C424.
V-16 251C 2500 C425.
V-16 251C 2750 C628, C855, C855B.
V-16 251E 3000 C430, C630, M630.
V-16 251E 3200 HR616.
V-16 251F 3600 C636, M636.
V-16 251F 3700 LRC-2, LRC-3.
V-18 251F 4000 M640.
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