required at initial startup for actuating the air cylinder 75 to move the probe into engagement with the air track this may be provided from an external line connected at a valve 84 or from an onboard storage tank 85 a check valve 86 is positioned in the line between the probe and the storage tank 85 for one way flow from the probe to the tank for charging the tank all the components are shown in the off or rest position in fig8 when it is desired to move the vehicle along the track the valve 80 is moved to the on position connecting the valve 81 to the air cylinder 75 the valve 81 is then moved to the on position supplying air from the tank 85 to the air cylinder 75 and moving the probe downward into engagement with the air track this engagement provides air from the track to the lines 87 88 in a manner to be described the valve 81 may be released and air in line 87 maintains the air cylinder 75 in the expanded condition and also recharges the tank 85 through the check valve 86 air in line 88 provides air for the air bearing 16 with the transporter now floating on the air film and ready for movement the transporter may be moved manually or may be moved by opening valve 83 and energizing the air.