NW-Mailing-List Digest, Driver quartering?

[NW Mailing List]

Jimmy – 

It shouldn’t have had any effect on setting the valves, because each side is a unit unto itself.  The only time it would affect that would be if the locomotive had Young valve gear which N&W never used.

I’m not a mechanical engineer, but it seems to have something to do with dynamic augment, the forces acting on one side of the engine due to the power impulses from the other side.  I can’t tell you how it works, but I can tell you that it’s a long-established fact.  

It was a matter of custom to make the right hand lead; the PRR went the other way, for the possible reason I cite in that eMail.  It would be like the PRR to do it that way.  The effects would actually be pretty small in practice, but PRR dotted a lot of those i’s and crossed a lot of that kind of t’s. 

Sorry I can’t explain it better, but maybe someone else can.

EdK

From: NW Mailing List 
Sent: Friday, March 21, 2014 9:28 AM
To: NW Mailing List 
Subject: Re: NW-Mailing-List Digest, Driver quartering?

"they had trouble setting the valves --- or possibly performing some similar type work -- until someone (from "headquarters") belatedly informed them that the PRR engines had LEFT HAND lead." 

Which begs the question, why would it matter which side is in the lead?

"For engineering reasons, the side that has the lead pounds the rail the hardest."

Why would the side that leads pound the rail hardest?


Jimmy Lisle



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