The URBA mass transport system was a suspended monorail design that used suction to lift the train off its rail. It was designed by the Compagnie d'Energetique Lineaire mb. At least two prototypes were built in Lyon in 1968 and tested on a 79-metre track. The URBA 4 and URBA 8 prototypes carried 4 and 8 passengers respectively. Propulsion was provided by Merin Gerin linear motors.
References
URBA mass transport system Wikipedia(Text) CC BY-SA