RAI/Specific Works/TBT-RAI-007

Third Rail Safety (DC Electrification)

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Presenter		Project
Location		Date

The third rail carries 750V DC traction current on Southern and Merseyrail networks.
Contact with the third rail is almost always fatal — 750V DC causes immediate cardiac arrest.
The conductor rail runs alongside running rails at ground level and is top-contact.
It is not always obvious which rail is energised — current rails exist on both sides.
The rail remains live during normal operations and is only switched off during isolations.
Short-circuiting devices must be applied after isolation to confirm the rail is safe.
Tools and materials must never be placed on or near the conductor rail.
The rail can be re-energised remotely without warning if isolation is incorrect.
All persons near the third rail must hold valid PTS and third rail awareness competence.
Network Rail standards and the Rule Book set out requirements for DC conductor rail work.

Prevent electrocution	750V DC kills instantly — the third rail is the most dangerous railway element.
No warning	The conductor rail looks the same whether live or dead.
Remote re-energisation	The rail can be switched on remotely, making isolation procedures critical.
Legal compliance	Network Rail standards mandate specific competence for third rail work.

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See also: Rail Safety Awareness | Overhead Line Equipment (OLE) Safety

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