To enable a plurality of moving bodies to independently travel with one pipe by providing a high pressure header at a bracket of the moving body moving in the pipe by air pressure, and supplying air pressure received by the high pressure header, to a driving air motor of a truck traveling on rails.

A moving body 2 is enclosed in a pipe P provided with a slit at the lower part along an axis, and first and second runner seal parts 4, 5 are provided at both longitudinal ends of the moving body 2 through a communicating pipe 3. The moving body 2 is provided with a bracket 6 protruded from the slit S, and a truck 10 provided with wheels 11 travelable on a pair of rails R1, R2 is linked with the bracket 6 through a bracket 12. The bracket 6 is provided with a high pressure header 30 communicated with the communicating pipe 3. This high pressure header 30 is connected to a driving air motor 35 provided in the truck 12, through a line L, and the wheels 11 are driven to travel by the air motor 35.