It’s called a “Side Arm Pusher” … the Northeast Railfan (.net) site has several. As I understand it, the gadget under the cab window is lowered to where the end contacts and pushes cars on an adjacent track … typically for coal dumping, etc. The cab is that tall narrow nightmare because it’s designed for one person operation, and that person can see out either side, and over the top of what’s being pushed.
WHY you would want to move cars in this manner is still lost on me.
Matthew (OV)