MLW M420 vs. M420R

Discussion of products from the American Locomotive Company. A web site with current Alco 251 information can be found here: Fairbanks-Morse/Alco 251.

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Re: MLW M420 vs. M420R

Postby MEC407 » Mon Feb 15, 2010 1:09 pm

Allen Hazen wrote:(*) For those not in the know: the CE618 was a diesel hood unit with a 16-251 engine rated at 2400 hp (= roughly 1800 kw), built (by Commonwealth Engineering) in 1978 for the narrow (3'6") gauge lines of the Western Australian Government Railway: the last Alco-engined locomotive design introduced in Australia. So, sharing with the M420 the property of being a "post-Alco Alco."


2400 HP from a 16-251 was pretty standard in the early to mid '60s, but by the late '70s, that engine had proven itself capable of producing a reliable 3600 HP. Is there any particular reason why CE chose to give it such a low rating, rather than using a 12-251 (which by 1978 could reliably produce 2400 HP)?
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Re: MLW M420 vs. M420R

Postby Allen Hazen » Mon Feb 15, 2010 7:36 pm

Re: MES407's query on the horsepower.

Sorry, my mistake: the CE618 had a 12-251 engine, NOT a 16-251. (So, in 1978, CE built locomotives with the 12-251 engine at two different horsepower ratings: 2000 hp in the NSW 80 class, 2400 in these Westralian units.)
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Re: MLW M420 vs. M420R

Postby MEC407 » Mon Feb 15, 2010 7:47 pm

That makes sense. Thanks for the clarification. :-D
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Re: MLW M420 vs. M420R

Postby Engineer Spike » Fri Apr 05, 2013 8:02 pm

While on the M420 topic, what wheel slip system was used? Did Bombardier/MLW have its own, or did it use the same as a U23B or B23-7?
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