Tonnage reduction with temperature falling

[NW Mailing List]

Don’t think temperature affected thermodynamics of the locomotives that much.  As long as the water in the tender didn’t freeze (and that happened on an A-tank on the Columbus district once, I’m told) the feedwater heaters still did their job.

Ed King

From: NW Mailing List via NW-Mailing-List 
Sent: Sunday, December 16, 2018 10:01 PM
To: NW Mailing List 
Cc: NW Mailing List 
Subject: Tonnage reduction with temperature falling

I was under the impression that the reason the tonnage went down with temperature was thermodynamics of water evaporation to get the needed pressures of steam. The point about oil and grease viscosity makes good sense as well. 


Mike Shockley  


--------------------------------------------------------------------------------
________________________________________
NW-Mailing-List at nwhs.org
To change your subscription go to
http://list.nwhs.org/mailman/options/nw-mailing-list
Browse the NW-Mailing-List archives at
http://list.nwhs.org/pipermail/nw-mailing-list/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist6.pair.net/pipermail/nw-mailing-list/attachments/20181217/6bab381c/attachment.html>