Them Ol' Steem injines

[NW Mailing List]

Brent,

This is my second reply about Y4’s having bridgepipes.  Jim Nichols mentioned that 2080 had them and I said before 2082 and 2085.  I just found a photo of 2080 and now there are three known Y4s so equipped.  Only through photos can we determine this.

Bud Jeffries

From: NW Mailing List 
Sent: Thursday, August 20, 2015 7:14 AM
To: nw-mailing-list at nwhs.org 
Subject: RE: Them Ol' Steem injines

I knew some of the Y3/Y3a class got the bridge pipe low pressure engines but I did not know this was also done with any Y4's. What were the locomotive numbers for these upgraded Y4's? 

Brent Greer 


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Date: Wed, 19 Aug 2015 21:34:55 +0000
To: nw-mailing-list at nwhs.org
Subject: Re: Them Ol' Steem injines
From: nw-mailing-list at nwhs.org


The Y3's sold to the Pennsy also had 18k tenders. Apparently, N&W thought better of this later. Subsequent Y's sold later had only 16k tenders. The rest of the 18k's stayed on the N&W. The bridgepipe low pressure engines, by the way, had originally been on the Y5's as built. When the Y5's got cast steel frames,  frugal N&W reused their old front engines on selected Y3's and Y4's.(probably the rear ones too, but we have no spotting feature for this.)


Jim Nichols




On Wednesday, August 19, 2015 12:51 PM, NW Mailing List <nw-mailing-list at nwhs.org> wrote:




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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