I'm looking for any information on a GE center cab switcher, builder's number 15016. I'm told it was built in 1941, and a look at R. Tourret's listing of US Army locomotives shows a 23 or 25 ton 15014, with a 1941 date. But who was 15016 built for, is it a 45 or 50 T, and where was it used? Any info would be appreciated.

15016 50T D/E B-B Std 150hp Cum HBI-600 5/17/1941 B-B-100/100-2GE733
US Navy, Mare Island Naval Shipyard #4, Vallejo, Calif. Center cab
Elmhurst-Chicago Stone #S-10 > #SU-545, Elmhurst, Ill

Thanks! Not surprised, given the date, that it was a Navy unit.