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Re: WP&Y #61 under restoration in Antonito, CO

December 05, 2017 01:53PM avatar
MSRRKevin Wrote:
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> I never fully understood the advantages of this
> design vs having the cab moved back just a few
> more feet.

wpyr61baldwin460buildersphoto.jpg

untitled.jpg

Look at where the Johnson bars are in these photos. In each case the cab is centered over the Johnson bar.

Designers of that era couldn't have cared less about any form of ergonomics or about making life easier for engine crews. Their only goal was to move the train from point A to B.

The real reason for mounting the cab there, was because that was where it was convenient to mount the Johnson bar, and they didn't want it to hit the front of the cab. I assume that when railroads moved the cabs to the rear on some engines, that they found a new anchor point for the Johnson bar so it could be moved back to where the engineer could reach it.

The same thing holds true for camelback engines. On a conventional locomotive, the Johnson bar was connected to the valve gear by a reach rod which had to be substantial, rigid, and straight to carry the forces placed upon it. The wide Wooten firebox made a straight reach rod impossible, so since the designers couldn't move the valve control to the engineer, they moved the engineer to the valve gear. Look at photos of camelbacks. In every case, the cab is centered over the reverse shaft, and the Johnson bar is simply an extension of the reverse arm that the reach rod usually connects to.

With the advent of power reverses, cabs on camelbacks could be moved to the rear end again since the reach rod from the power reverse to the reverse lever (no longer a Johnson bar) carried very little force and could be made with bends and offsets in its length.
Subject Author Posted

WP&Y #61 under restoration in Antonito, CO Attachments

rod December 04, 2017 01:43PM

Re: WP&Y #61 under restoration in Antonito, CO Attachments

bcp December 04, 2017 02:09PM

Re: WP&Y #61 under restoration in Antonito, CO

kcsivils December 04, 2017 02:28PM

Re: WP&Y #61 under restoration in Antonito, CO

nedsn3 December 04, 2017 05:15PM

Re: WP&Y #61 under restoration in Antonito, CO

DWB December 06, 2017 07:46PM

Re: WP&Y #61 under restoration in Antonito, CO

Wayne Hoskin December 05, 2017 02:37AM

Re: WP&Y #61 under restoration in Antonito, CO

jeffsmith December 09, 2017 03:37PM

Re: WP&Y #61 under restoration in Antonito, CO

davidtltc December 04, 2017 02:50PM

Re: WP&Y #61 under restoration in Antonito, CO

porterno2 December 04, 2017 03:31PM

Re: WP&Y #61 under restoration in Antonito, CO

Will Gant December 04, 2017 04:32PM

Re: WP&Y #61 under restoration in Antonito, CO

Casey Akin December 08, 2017 10:50PM

Re: WP&Y #61 under restoration in Antonito, CO

jim pallow December 04, 2017 04:05PM

Re: WP&Y #61 under restoration in Antonito, CO

Charlie Mutschler December 04, 2017 04:30PM

Re: WP&Y #61 under restoration in Antonito, CO

Will Gant December 04, 2017 04:33PM

Re: WP&Y #61 under restoration in Antonito, CO

Jerry Huck December 04, 2017 05:46PM

Re: WP&Y #61 under restoration in Antonito, CO

jim pallow December 05, 2017 09:40AM

Re: WP&Y #61 under restoration in Antonito, CO

jim pallow December 05, 2017 09:44AM

Re: WP&Y #61 under restoration in Antonito, CO Attachments

Kelly Anderson December 05, 2017 06:06AM

Re: WP&Y #61 under restoration in Antonito, CO

Tomstp December 05, 2017 08:48AM

Re: WP&Y #61 under restoration in Antonito, CO

jcpatten December 05, 2017 09:07AM

Re: WP&Y #61 under restoration in Antonito, CO

jim pallow December 05, 2017 09:51AM

Re: WP&Y #61 under restoration in Antonito, CO Attachments

MD Ramsey December 05, 2017 02:32PM

Re: WP&Y #61 under restoration in Antonito, CO

MSRRKevin December 05, 2017 10:01AM

Re: WP&Y #61 under restoration in Antonito, CO

dave2-8-0 December 05, 2017 10:54AM

Re: WP&Y #61 under restoration in Antonito, CO Attachments

Casey Akin December 08, 2017 10:37PM

Re: WP&Y #61 under restoration in Antonito, CO Attachments

Kelly Anderson December 05, 2017 01:53PM

Re: WP&Y #61 under restoration in Antonito, CO

philip.marshall December 05, 2017 02:34PM

Re: WP&Y #61 under restoration in Antonito, CO

Kelly Anderson December 06, 2017 07:14AM

Re: WP&Y #61 under restoration in Antonito, CO

Casey Akin December 08, 2017 10:47PM

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hank December 09, 2017 06:20AM

Re: WP&Y #61 under restoration in Antonito, CO

rdamurphy December 10, 2017 07:21AM

Re: WP&Y #61 under restoration in Antonito, CO

et&wnc December 05, 2017 11:39AM

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