Guiding device for double-rail trains

Claim 1

A GUIDING DEVICE FOR A BOGIE OF A TRAIN OR THE LIKE ADAPTED TO RUN ALONG TWO RAILS OF A NARROW GAUGE DOUBLERAIL TRACK, EACH OF SAID RAILS HAVING AN UPPER, SUBSTANTIALLY HORIZONTAL FLANGE AND A SUBSTANTIALLY VERTICAL WEB, SAID GUIDING DEVICE COMPRISING A BOGIE PART; A SINGLE PAIR OF COAXIAL WHEELS ROTATABLY MOUNTED ON SAID BOGIE PART AND ADAPTED TO RUN ALONG THE UPPER SIDES OF SAID FLANGES; TWO PAIRS OF GUIDE ROLLERS MOUNTED ON SAID BOGIE PART SO AS TO BE ROTATABLE ABOUT SUBSTANTIALLY PERPENDICULAR AXES AND DISPOSED BETWEEN SAID TWO RAILS, THE WHEELS OF EACH OF SAID TWO PAIRS OF GUIDE ROLLERS BEING DISPOSED BEHIND EACH OTHER, AS SEEN IN THE LONGITUDINAL DIRECTION OF SAID RAILS, AND RESPECTIVELY TO OPPOSITE SIDES OF THE AXIS OF SAID SINGLE PAIR OF COAXIAL WHEELS, ONE OF SAID PAIRS ENGAGING WITH AND ADAPTED TO RUN ALONG THE WEB OF ONE OF SAID RAILS AND THE OTHER PAIR ENGAGING WITH AND ADAPTED TO RUN ALONG THE WEB OF THE OTHER RAIL FOR PREVENTING SAID WHEELS FROM DERAILING IN LATERAL DIRECTIONS; AND A PAIR OF BRACING ROLLERS ARRANGED AT A DISTANCE FROM EACH OTHER SMALLER THAN THE DISTANCE BETWEEN THE WEB-ENGAGING PORTIONS OF CORRESPODNDING GUIDE ROLLERS OF SAID TWO PAIRS OF GUIDE ROLLERS, EACH OF SAID BRACING ROLLERS BEING DISPOSED BETWEEN THE TWO GUIDE ROLLERS OF EACH PAIR, AS SEEN IN SAID LONGITUDINAL DIRECTION, AND MOUNTED ON SAID BOGIE PART SO AS TO BE ROTATABLE ABOUT A SUBSTANTIALLY HORIZONTAL AXIS AND ADAPTED TO ENGAGE WITH THE BOTTOM FACE OF SAID UPPER FLANGE OF ONE OF SAID RAILS FOR PREVENTING SAID WHEELS FROM BEING LIFTED OFF SAID RAILS.