It’s construction time again!
This is some sort of funky diesel hydraulic tug with a big welder sitting on top for work on the Metrorail track. It’s actually kinda cute.
Now with even MORE couplers! The one with the array of Pogo Pins on it matches the Metrorail trains. I’m not sure if, or how, the electrical interface would be used. Third rail power certainly isn’t. It might even be built to be able to tug the Budd UTV cars around where the onboard motors can’t be powered.
This rig is usually seen in action only on weekends when closing a track to perform maintenance does not affect the train schedule too badly.