PURPOSE: To carry out necessary maintenance promptly by laying rails of the length at which a vehicle is easily removed from a rail, on a running path main body frame, in order, in line, by a bolt, and by forming the rails into one body, and by enabling removal of the rail at any one point.

CONSTITUTION: Two rails 2, 2 running in parallel to one another, are provided and supported on and with a running path main body The cross section of the rail 2 is an L-shape, and its length is determined so that the rail can be easily laid on the running path main body frame 1 by a bolt 3, while it can be removed, and that a vehicle is removed. The rails are added until they are formed into one line, while a vertical piece 21 is put on the inner surface of the running path main body frame 1, and a mounting bolt 4 is inserted between the frame and the rail, and is fastened. The rail of a point at which a vehicle incapable of running stops, can be removed from the main body frame, and replacement and maintenance and the like of batteries can be carried out promptly and easily.