Y Class, Etc

[NW Mailing List]

Ed:
 
Completely agree.  Just wanted to give Pete his due.
 
Dave Phelps
 
 
In a message dated 6/29/2013 7:13:31 P.M. Eastern Daylight Time,  
nw-mailing-list at nwhs.org writes:

 
 
Dave - 
 
There were almost as many places to measure steam locomotive horsepower  as 
there were people who measured it.
 
The only really meaningful place was at the rear drawbar.  That’s  where 
the rubber met the road, so to speak.
 
EdK
 
 

 
From: _NW Mailing List_ (mailto:nw-mailing-list at nwhs.org)  
Sent: Saturday, June 29, 2013 7:38 AM
To: _nw-mailing-list at nwhs.org_ (mailto:nw-mailing-list at nwhs.org)  
Subject: Re: Y Class, Etc


 

 
Ed:
 
I'm confident Pete will clarify in his own right, but for my part I read  
his posting as meaning the boiler horsepower capability as a "steam  
generator", not the drawbar horsepower that you're citing.
 
Dave Phelps
 
 
In a message dated 6/29/2013 6:55:44 A.M. Eastern Daylight Time,  
nw-mailing-list at nwhs.org writes:

Pete  -

Where do you get your horsepower figures?  The rating for the  Y-6 was 
worked 
out using train resistance formulae and the actual  topography of the 
territory by Dave Stephenson and published in the  Arrow.  There was never 
a 
7000 horsepower figure put out for the  A.  The first test was 6300 which 
Engineer of Tests Bob Pilcher  felt was too high.  He felt the A was 
actually 
in the 5300  horsepower range and that the dynamometer car's recording 
mechanism was  in error.  The A was not a Y "modded for speed".  The only  
feature the A shared with the Y was the tender (and maybe the electical  
system, and stuff like that).

One has to be careful tossing  "facts" around among folks who don't know 
much 
about the N&W.   They're like football players who pick up a fumble and run 
with  it.

EdKing

-----Original Message----- 
From: NW Mailing  List
Sent: Friday, June 28, 2013 4:17 PM
To: NW Mailing  List
Subject: Re: Y Class, Etc

Query:  "Again the A class was  essentially a Y modded for speed . . ."   
The 
boilers (the  most important part of a steam loco, I'm finally beginning to 
realize)  were very different - 5500 HP or so for a Y6 and 7000 HP or so 
for 
an A;  also very different in design, particularly, the fireboxes.

pete  groom
On Jun 27, 2013, at 7:19 PM, NW Mailing List  <nw-mailing-list at nwhs.org> 
wrote:


> There was purpose  behind designs, the Big Boy was meant to tackle 

Sherman 

> Hill, it  has larger drivers for speed not to just get over the grades 

but 

>  out west is a lot of land to cover and get over it as fast as  possible.

>

> N&W had numerous tough grades and perhaps  harder curves, speed was not 

> exactly the big handle to get over its  grades than to get as much 

tonnage 

> over as possible, double heading  and pushers a common scene on the N&W.

> Again the A class was  essentially a Y modded for speed and larger 

drivers 

> for the not so  mountaneous and level routes for speed, but they were put 

> on the  plodding Y6 runs as well.

>

> The railroads had their engines  made -their- way for -their- purposes.

>

> The DM&IR had  their yellowstones and were more powerful than the big 

boys, 

>  why...heavy ore trains, which can be far heavier than any coal  train.

>

> -Lynn-



> . .  .


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