K1 vs K2 cab w/ and w/o streamlining

[NW Modeling List]

Mike,
The K-1 class as originally built had cabs with square or flat front cabs and much smaller rounded sand domes. When they were "modernized" they received the sloped cab and the square sand domes as well as some other changes like sheathed fireboxes and bigger tenders. A huge improvement in looks to me. They were/are my favorite 4-8-2's.
The Bowser model more closely resembles the K-2/K-2a as built with their square cabs. As far as I know they didn't get the sloped cabs until they were streamlined.
Sloped cabs became more popular after the war as they allowed better access for firebox maintenance as I've read and been told. I like their looks much better too.
Roger HuberDeer Creek Locomotive Works 

    On Saturday, July 6, 2019, 08:57:05 PM CDT, NW Modeling List via NW-Modeling-List <nw-modeling-list at nwhs.org> wrote:  
 
 I have a Bowser USRA Mountain.  I painted it and numbered it as a K1 while trying to create the special sand dome.  I saw a K1 picture and realized the cab front wall was sloped but not on my model.  Since it is a diecast boiler, I decided it looked more like a K2 and began researching those.  It seems to me that some K2 have vertical front cab wall and others are sloped.  Perhaps this is a K2/K2a difference..  I did find a picture of K2 119 and 123 that have the vertical cab front.  They have a sand dome more like the Bowser...maybe.
Question:  Did all the cab walls slope with streamlining added?  Was there a reason?  Were the cabs changed out or refabricated?  I hope to make a reasonable K2...
Thank you all,Mike Shockley________________________________________
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