What emergency procedure is associated with pantographs when electrical issues arise?

When addressing electrical issues related to pantographs, lowering the pantograph is the appropriate emergency procedure. Pantographs are the devices on top of electric trains and some trams that connect to the overhead wires to draw power. In the event of electrical problems, such as a fault or a short circuit, lowering the pantograph effectively disconnects the train from the overhead power source. This prevents further electrical hazards and allows for safe access to the area for emergency responders.

Lowering the pantograph is critical because it also helps isolate the electrical system from potentially dangerous power surges that could occur during an electrical failure. By ensuring that the pantograph is not in contact with the overhead line, the risk of electrocution or additional electrical incidents is mitigated, making it a standard procedure in emergency response to electrical issues with trains or trams equipped with pantographs.