RAI/Track Safety/TBT-RAI-016

Tunnel Working (Rail)

Rail Works › Track Safety › Tunnel Working (Rail)

All Categories/Rail Works/Track Safety/Tunnel Working (Rail)

Tunnel Working (Rail)

Toolbox Talk Record

Ref: TBT-RAI-016  |  Issue: 1  |  Date: March 2026
PresenterProject
LocationDate

What?

  • Rail tunnel working combines confined space hazards with the risk of being struck by trains.
  • All personnel must hold valid PTS (Personal Track Safety) certification before entering rail tunnels.
  • Rail tunnels have limited ventilation, creating risk of diesel fume build-up and oxygen depletion.
  • Safe refuges or positions of safety must be identified and briefed before entering any tunnel.
  • Noise levels inside tunnels are significantly higher, making warning signals harder to hear.
  • Electrification hazards from overhead line equipment (OLE) or third rail may be present in tunnels.
  • Emergency evacuation routes must be established, briefed, and signed before work commences.
  • Work in rail tunnels typically takes place during engineering possessions with strict time limits.
  • Lighting, dust, smoke, and restricted sightlines all reduce visibility inside rail tunnels.
  • Network Rail standard NR/L2/OHS/019 sets specific requirements for safe working in tunnels.

Why?

Prevent fatalitiesWorkers have been killed in rail tunnels by trains, electrocution, and toxic atmospheres. Strict controls are essential.
Legal complianceRailway-specific regulations and Network Rail standards impose strict duties for tunnel working activities.
Rescue capabilityLimited access and long evacuation distances in tunnels mean on-site rescue plans must be rehearsed.
Health protectionDiesel fumes, dust, and poor ventilation in tunnels cause respiratory harm without proper controls.
Do Don't
  • Ensure all personnel hold valid PTS and tunnel-specific safety briefing certification
  • Identify and brief all workers on positions of safety and refuge locations before entry
  • Confirm the possession is in place and track isolation verified before entering the tunnel
  • Carry personal gas monitors to detect oxygen depletion and toxic gas build-up
  • Maintain continuous communication between tunnel teams and the COSS at all times
  • Carry a personal torch and check emergency lighting is operational before entry
  • Wear appropriate RPE where diesel fume or dust exposure cannot be eliminated
  • Follow the agreed evacuation plan immediately if an emergency alarm is raised
  • Check ventilation fans are operational before and throughout the working period
  • Confirm OLE isolation or third rail discharge before working near electrified track
  • DON'T enter a rail tunnel without confirmed possession and track isolation
  • DON'T remove or switch off personal gas monitors while inside the tunnel
  • DON'T work beyond the agreed time limit for the possession in the tunnel
  • DON'T block emergency evacuation routes with materials, plant, or equipment
  • DON'T assume the tunnel atmosphere is safe — monitor continuously throughout
  • DON'T approach OLE or third rail unless confirmed isolated and earthed
  • DON'T rely solely on hearing for train warnings — noise levels mask signals
  • DON'T enter without knowing the location of all positions of safety and refuges
  • DON'T use petrol-powered equipment inside tunnels due to carbon monoxide risk
  • DON'T work alone or out of sight of other team members inside a rail tunnel

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

RAMS Builder

Generate professional Risk Assessment and Method Statements in minutes. 10 document formats, site-specific content, instant Word download.

Learn More