Power Supply Switches
Before a tram can be operated the main electrical circuit must be closed. This is done by the motorman moving a large overhead switch, usually located on the bulkhead behind the driving position, from the "off" to the "on" position.
Trams fitted with air brakes have a separate switch to operate the air compressor. This is sometimes located near the compressor (which is normally located under the floor of the passenger compartment) rather than in the driver's cabins.
Read more about this topic: Tram Controls
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