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Some [[railway]]s have a fourth rail for the return of the current.
Some [[railway]]s have a fourth rail for the return of the current.
[[Voltage]] in the third rail is typically 600 volts DC, so touching it while grounded usually proves fatal.
[[Voltage]] in the third rail is typically 600-1500 volts DC (direct current), so touching it while grounded usually proves fatal.
The "'''third rail'''" of politics is an issue so potent and one-sided that no politician dares challenge the traditional view.
The "'''third rail'''" of politics is an issue so potent and one-sided that no politician dares challenge the traditional view.