Answer: thirdrail

AnswerCrossword Clue
THIRDRAIL

It electrifies cars through contact shoes

THIRDRAIL

Dangerous subway track

THIRDRAIL

Train's electricity source

THIRDRAIL
Source of electric current.
THIRDRAIL
Subway power conductor
THIRDRAILSubway danger
THIRDRAILSubway power source
THIRDRAILPower source for a subway train