[N&W] Rebuilding of K's, K2's, and K2a's

[nw-mailing-list at nwhs.org]

I am aware that the N&W made many improvements to it's mountain type 
locomotives over the years, thus improving their performance and extending 
their useful service lives.  However, I am wondering why the N&W motive 
power officials did not approve of two improvements in particular that I 
believe would have made the performance of these locomotives even better. 
These are the cast steel frame and front-end throttle.  I realize that the 
N&W while thrifty, was also cash rich, and these improvements would 
probably not have cost any shareholders their dividends.  Is there any 
motive power department literature, or correspondence pertaining to the 
pro's and con's of including these upgrades in the rebuilding 
programs?  What about fully equipping all engine and tender axles with 
roller bearings?  I respect Roanoke's work and the K's but I was curious 
why these improvements were not made.

Sincerely,
Nathan Driscoll