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Rail push trolley
A Rail push trolley or simply a push-trolley is a hand-pushed trolley used to inspect the rails and other track-side railway infrastructure. It is a simple trolley, pushed by two or four persons (called trolleymen), with hand brakes to stop the trolley. When the trolley slows down, two trolleymen jump off the trolley, and push it till it picks up speed. Then they jump into the trolley again, and the cycle continues. The trolleymen take turns in pushing the trolley so that the speed is maintained and two persons do not get tired. Four persons are also required to safely lift the trolley off the rail tracks when a train approaches.
==Use==
Rail tracks have a tendency to develop various defects including cracks, loose packing etc., which may lead to accidents. The first rail inspections were done visually. Push trolley inspections formed a very important part of these visual inspections.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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