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- From: atrw0176@cellar.org (Atrw93)
- Newsgroups: rec.railroad
- Subject: Re: Compound Locomotives
- Message-ID: <0iXcuB3w164w@cellar.org>
- Date: 17 Nov 92 00:21:56 GMT
- References: <BxBEI9.5px@fc.hp.com>
- Sender: bbs@cellar.org (The Cellar BBS)
- Organization: The Cellar BBS and public access system
- Lines: 38
-
- rogerm@PROBLEM_WITH_INEWS_GATEWAY_FILE (Roger Mitchell) writes:
-
- > were the N&W Y class 2-8-8-2 mallets. They were true mallets and were
- > highly successful when used on slow heavy coal drags, but when it came
- > to hauling the mail on fast freight the class A simple articulated did
- > the job far more efficiently. One other note about many compound locomotives
-
- One other comment (sorry if someone else already picked up on this)
-
- The greater reason for the high speed performance of the "A" - and the
- feature was copied fron UP Challengers ( and used in others) and it was
- Woodward at ALCO who developed this:
-
- Mallets were articulated with two degrees of freedom, "yaw" or
- horizontal turning to negotiate curves and "pitch" which allowed
- the two engines to flex over vertical curves. This reduced the
- benefit of the springing and led to poor adhesion on less than
- perfect track and generally bad tracking at the higher speeds.
-
- Woodward simplified the atriculation to one degree of freedom,
- that of "yaw". While the locomotive could respond to horizontal
- curves as two 6-coupled engine trucks, it behaved like
- a twelve-coupled engine with respect to vertical curves
- as well as profile and cross-level variations. It was a great
- successs.
-
- This concept was copied into the GG-1 electrics and provided great
- trackability up to 125 mph. And they were able to manuver on even the
- poorest yard trackage that could sustain the weight.
-
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- Your Attention Please! Thank you for reading this far.
- ATRW 93 <atrw0176>
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