Class A sheathed smokebox.

NW Mailing List nw-mailing-list at
Sat Feb 4 15:22:49 EST 2023


    It’s just an extension of the lagging and boiler jacket out and over the smokebox . I not sure what the N&W reasoning was for sure . Quit a few of the Y class got 

The same treatment , I was on the C&O 1309 crew we insulated the smokebox  that never was when in service. It helps with expansion and contraction  of the front tube sheet retaining heat so you get slower cooling . I am sure it helped on the feed water system  also on the” A” .  I am no expert but all the heat you can retained in a boiler is a good thing 



Larry Evans



From: NW-Mailing-List [mailto:nw-mailing-list-bounces at] On Behalf Of NW Mailing List
Sent: Saturday, February 04, 2023 2:36 AM
To: 'NW Mailing List' <nw-mailing-list at>
Subject: RE: Class A sheathed smokebox.


Please forgive my ignorance and teach me what a “sheathed” smokebox is and its purpose, as well as how to know from a photo if it was installed.  Thank you!


Vic Chudoba 


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Sent: Friday, February 3, 2023 12:01 AM
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Subject: RE: Class A sheathed smokebox.



Best I can do  1213,1214,1217,1218


Larry Evans


From: NW-Mailing-List [ <mailto:nw-mailing-list-bounces at> mailto:nw-mailing-list-bounces at] On Behalf Of NW Mailing List
Sent: Wednesday, February 01, 2023 2:51 PM
To: NW Mailing List < <mailto:nw-mailing-list at> nw-mailing-list at>
Subject: Class A sheathed smokebox.


Does anyone know how many/what numbered Class A locos received the sheathed smokebox?


Jimmy Lisle




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