Superheaters and Throttle Linkage

[NW Mailing List]

That W-2 778 pictured in Thieme's book has the damper.

Unusual at such a late date.

EdKing
----- Original Message ----- 
From: "NW Mailing List" <nw-mailing-list at nwhs.org>
To: "NW Mailing List" <nw-mailing-list at nwhs.org>
Sent: Monday, August 25, 2008 5:32 PM
Subject: RE: Superheaters and Throttle Linkage



> On very early superheated locomotives, a damper inth e smokebox restricted 

> the flow of furnace gases through the flues containing the superheater 

> units when the throttle was closed.  The presence of this type of device 

> is usually visible by way of a small pendulum-shaped counterweight that is 

> located on the outside of the smokebox, near the front tube sheet on the 

> engineer's side.  PRR used this device extensively.  It was also found on 

> N&W's K2's as built, perhaps others. Its use was eventually discontinued, 

> probably by the early 1920s.

>

> Dave Stephenson

>

>

>

>

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