This paper model is a Handcar (aka pump trolley, pump car, jigger, Kalamazoo or draisine in many other parts of the world), a railroad car powered by its passengers, or by people pushing the car from behind, the papercraft designed by UHU02. A handcar is mostly used as a maintenance of way or mining car, but it was also used for passenger service in some cases. A typical design consists of an arm that pivots, seesaw-like, on a base, which the passengers alternately push down and pull up to move the car.
Handcars have been normally used by railway service personnel for railroad inspection and maintenance. Because of their low weight and small size, they can be put on and taken off the rails at any place, allowing trains to pass. Handcars have since been replaced by self-propelled vehicles that do not require the use of manual power, instead relying on internal combustion engines or electricity to move the vehicle. Handcars are nowadays used by handcar enthusiasts at vintage railroad events and for races between handcars driven by five person teams.