Changes

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 rails is typically 600 volts DC, so touching it while earthed usually proves fatal.

[[Voltage]] in the third rail is typically 600 volts DC, 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.

[[Social Security]] and other benefits for [[senior citizens]], who vote in greater proportion to other age groups, represent the classic third rail of politics.

[[Social Security]] and other benefits for [[senior citizens]], who vote in greater proportion to other age groups, represent the classic third rail of politics.

The term derives from the railway use.

The term derives from the railway use.