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[quote user="rrebell"]Also I am OK with an S-4 as iit was mainly the same but different truck which was avalible in 1939 if they had wanted to use it.[/quote] You would actually be looking for the S-2. S-1 and S-3 are the 660HP Alco switchers, main difference being the trucks.  <a href="https://en.wikipedia.org/wiki/ALCO_S-1_and_S-3">https://en.wikipedia.org/wiki/ALCO_S-1_and_S-3</a> S-2 and S-4 are the turbocharged 1000HP.  <a href="https://en.wikipedia.org/wiki/ALCO_S-2_and_S-4">https://en.wikipedia.org/wiki/ALCO_S-2_and_S-4</a> Edit: Also add GE 44ton, EMD SC and Plymouth switchers to your list. Pre 1940 switchers here: <a href="https://en.wikipedia.org/wiki/EMC_Winton-engined_switchers">https://en.wikipedia.org/wiki/EMC_Winton-engined_switchers</a>
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