In the train-shed at Worbboden the orange 1200VDC-trains as well as the blue 600VDC-trams of RBS are being maintained. The overhead contact line can be switched from one Voltage to the other. Isolators, Earthing-Rods as well as the Barriers at the stairs leading to the maintenance plattforms are interlocked to guarantee safe operation. A short piece of conductor rail provides smooth transition from the low portal to the high position of the contact wire within the hall.