Vehicles for travelling along a prepared track

Claim 1

A VEHICLE FOR TRAVELLING ALONG A PREPARED TRACK, SAID TRACK BEING PROVIDED WITH SURFACES FOR GUIDING AND SUPPORTING SAID VEHICLE INCLUDING AT LEAST TWO OPPOSITELY FACING SURFACES EACH HAVING A VERTICAL COMPONENT OF DIRECTION, SAID VEHICLE HAVING CUSHION SURFACES CO-OPERATING WITH THE SURFACES OF SAID TRACK INCLUDING AT LEAST TWO CUSHION SURFACES ARRANGED TO FACE TOWARDS AND COOPERATE WITH SAID TWO OPPOSITELY FACING SURFACES OF THE TRACK, AND MEANS INCLUDING AT LEAST ONE SUPPLY PORT IN EACH OF SAID CUSHION SURFACES ADJACENT TO THE PERIPHERY THEREOF FOR FORMING AT LEAST ONE CURTAIN OF FLUID WHICH IN OPERATION FLOWS ACROSS THE GAP WHICH EXISTS BETWEEN THE SAID CUSHION SURFACE AND THE CO-OPERATING SURFACE OF THE TRACK AT A SUBSTANTIAL ANGLE TO SAID CO-OPERATING SURFACE, EACH OF SAID CURTAINS OPERATING TO FORM, MAINTAIN AND CONTAIN AT LEAST IN PART A CUSHION OF PRESSURISED GAS WHEREBY THE VEHICLE IS MAINTAINED IN SPACED RELATIONSHIP TO SAID TRACK SURFACES.