Always wondered how electric trains work, they take power from either a live rail or overhead line. However to complete the circuit a return current path is required. I understand this is done via the wheels and running lines but can anyone explain exactly how this works?
If the running lines provide an electrical path back to the substation, they must be electrical insulated from the ground? if this is the case are the running lines not "live" ie carry a risk of electrocution? Also wonder how this current effects the signal track circuits? How are track circuit sections isolated from each other whilst allowing the return current to pass?
If the running lines provide an electrical path back to the substation, they must be electrical insulated from the ground? if this is the case are the running lines not "live" ie carry a risk of electrocution? Also wonder how this current effects the signal track circuits? How are track circuit sections isolated from each other whilst allowing the return current to pass?