Signalling Equipment Safety

Railway signalling equipment controls train movements and includes signals, points, track circuits, and interlockings.
Interfering with or damaging signalling equipment can cause trains to collide or derail with catastrophic consequences.
All signalling work must be carried out under a safe system of work agreed with the signalling engineer.
Signalling cables carry critical data and power; severing them can disable signals across a wide area.
Track circuits detect train presence; placing metal objects across rails can falsely occupy or clear a section.
Points machines contain powerful hydraulic or electric drives that can crush hands and fingers during operation.
Construction work near signalling equipment must be coordinated with the signaller and signal maintainer.
Electromagnetic interference from welding, generators, and heavy plant can affect signalling system operation.
Network Rail standards require notification and approval before any work that could affect signalling equipment.
All workers near signalling equipment must hold PTS and understand the restrictions on their activities.

Prevent collisions	Damaged or disrupted signalling allows trains to proceed into occupied sections, causing head-on or rear-end collisions.
Crush injuries	Points machines and signal mechanisms move with extreme force, crushing hands and limbs trapped in their path.
Network disruption	Severing a signalling cable or triggering false track circuit occupations can shut down an entire route for hours.

Do

Don't

Obtain Network Rail approval before working near any signalling equipment.
Coordinate all activities with the signalling engineer and signal maintainer.
Identify and mark all signalling cable routes before starting any excavation.
Keep a safe distance from points machines and signal mechanisms at all times.
Report any accidental contact with or damage to signalling equipment immediately.
Follow the safe system of work agreed for the specific signalling asset.
Assess electromagnetic interference risk from welding and generators near equipment.
Ensure all workers hold valid PTS and are briefed on signalling asset locations.
Use hand digging within the specified exclusion zone around signalling cables.
Maintain clear access to signalling equipment for maintenance technicians at all times.

DON'T touch, adjust, or interfere with signalling equipment under any circumstances.
DON'T place metal objects across rails; this disrupts track circuit detection.
DON'T sever or damage signalling cables during excavation or construction work.
DON'T put hands near points machines; they activate without warning.
DON'T weld or use generators near signalling equipment without interference assessment.
DON'T obstruct access to signal boxes, relay rooms, or equipment cabinets.
DON'T proceed with work that could affect signalling without Network Rail approval.
DON'T stack materials against or lean equipment on signalling asset housings.
DON'T ignore the signalling cable marker posts along the railway corridor.
DON'T attempt to reset or test signalling equipment; only trained technicians may do this.

See also: Rail Safety Awareness | Safe System of Work on Track

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