Railcar mover

A railcar mover is a road–rail vehicle (capable of travelling on both roads and rail tracks) fitted with couplers for moving small numbers of railroad cars around in a rail siding or small yard. They are extensively used by railroad customers because they are cheaper than owning a switcher locomotive, more convenient and cheaper than paying the railroad operator to do the switching, easier and more productive than manual moving of cars, and in addition they are more versatile since they can travel on road wheels to the cars they need to move, instead of needing clear track.
Manufacturers.
Numerous manufacturers produce railcar movers, in multiple countries.
North America.
North American brands include Trackmobile, Nordco Shuttlewagon, BOSS, and Rail King 
Ireland.
An Irish brand is Unilokomotive.
Germany.
German brands include Unimog, Zwiehoff and Zweiweg.
Italy.
Italian brands are Colmar and Zephir.
Turkey.
UMEL 