Them Ol' Steem injines

[NW Mailing List]

Jimmy,

I have no thoughts on these except an older Y with a bridgepipe could have 
been a little better.  In interviews when I asked was there any thought 
about using new valve travel on the older classes, the answers were always 
no.  As explained, the older classes were used in slow work and having a max 
DBHP at 15 MPH was satisfactory.  If a bridgepipe was applied it may have 
made a couple MPH difference but no more.

N&W must have thought this since three Y-3's with bridgepipes were sold 
during WWII to the UP and PRR.  Photographs show that the reminding 
bridgepipes were applied to Y-3, Y-3a and Y-4 classes.  What was significant 
was that the older Y's got 270 PSI boiler pressure and this resulted in the 
starting tractive effort being 90 percent of the Y-5/Y-6's.

Bud Jeffries

-----Original Message----- 
From: NW Mailing List
Sent: Monday, August 17, 2015 4:07 PM
To: NW Mailing List
Subject: Re: Them Ol' Steem injines

On 8/17/2015 1:07 PM, NW Mailing List wrote:
> The Y-5, yes; the Y-3 and Y-4, no.  Being the same capacity as the Y-6, 
> the Y-5 got all the refinements and were interchangeable in service as the 
> Y-6.  The Y-3 and 4’s were used in the yards, mine runs and other 
> secondary work.  They developed their max power at 15 MPH which was good 
> for this type of service.

Bud,
     Any thoughts on if there was any performance difference on the
Y3a's that were converted to the bridge pipes from the Y5's?

Jimmy Lisle

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