This system represents the pneumatic suspension and ramp on a public transportation vehicle.
The left pneumatic cylinder represents the suspension specifically, the suspension can be raised or lowered at the press of a button, and can only be raised or lowered when it has stopped moving in it's current direction.
The right pneumatic cylinder represents the ramp on the bus, the ramp can only be lowered the when the suspension has been fully lowered. While the ramp is lowered, the suspension can not be raised.
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