Posted by Maddie Farnsworth on July 18, 2011 
I think I read somewhere (Trains mag maybe) that MTA had a couple of GE 70 toners that were converted for tunnel use. This sure looks like a GE 70 tonner anyways. Regardless, cool photo of something not seen often.
Posted by Bill Caywood on July 18, 2011 
My first guess would be General Electric Co. diesel / third rail electric, based on many design features. My second guess would be Brookville based mainly on their ability to build custom locomotives for mining and other needs. Third rail electric operation is not that different from overhead wire pickup in mines. They also build industrial diesels of varying sizes and gauges so dual power is within the capabilities of Brookville. The round holes in the lower area in front of the cab would let hydrogen gas emitted by the batteries vent, so there is the possibility that this locomotive may have limited range operating on batteries alone. If operation on battery power only is possible then this would be called a tri-power engine.
Posted by Lester Zmudzinski on July 18, 2011 
GE 45 Ton Special Clearance is what the TA calls them. Nice get!
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