Here's all I've found so far.
From:
[
riograndesouthern.com]
Engine 76, with Joe Delaney at the throttle, hauled the last C&S narrow gauge train to Climax on August 25, and the three sister engines were finished on the C&S.
Not long after the last run, the engines were loaded on flat cars and taken to Denver. Abandonment of the Clear Creek Branch had come in 1939, and all narrow gauge rail had been removed from the Denver yard in 1942. Placing rails inside a seldom-used siding behind the roundhouse made a "temporary" arrangement for storage of the engines. There they remained until March 1945, when they were again sold to what was then called Morse Bros. Machinery Co. in Denver. Fortunately, the timing of these events allowed the engines to be spared being shipped to Alaska or scrapped in the war effort, as many other C&S engines were.
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I suppose by Sept 42, the need for it in AK was gone.
Bruce