Spark Arrestors

[NW Modeling List]

I am looking for some information about the spark arrestors that were 
applied to the ex NKP and Wabash GP 7's and 9's after the 1964 merger.From 
looking at photo's, it seems like they were applied right after the merger- 
regardless of the loco being repainted or not.

The dimensions, especially the height of it.

Were they made in-house by the N&W ? or were they from a supplier ?

They were removed in the late 70's early 80's, does anyone know why?

Any help would be appreciated,
Ken Rees 


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