PTS Working in Tunnels

Question 1

What is the primary additional hazard when working in a tunnel compared to open track?

Accepted Answer

Escape options are severely restricted and aerodynamic effects from passing trains are amplified

Answer

Trains travel faster inside tunnels than on open track

Answer

Electrified lines are always switched off inside tunnels

Answer

Mobile phones must be used instead of radios inside tunnels

Question 2

In a tunnel, refuge niches (alcoves set into the tunnel wall) must typically be provided at maximum intervals of:

Accepted Answer

25 metres

Answer

10 metres

Answer

100 metres

Answer

250 metres

Question 3

Before entering a tunnel to work, a COSS must:

Accepted Answer

Confirm the emergency procedures and refuges, and ensure all workers are briefed on the specific tunnel hazards

Answer

Obtain permission from the local council

Answer

Disable all lookout warning systems as they are ineffective in tunnels

Answer

Wait until all trains have been suspended on all routes through the tunnel

Question 4

The aerodynamic pressure wave produced by a train passing through a tunnel is significant because:

Accepted Answer

It can knock workers off their feet and cause tools or materials to become projectiles

Answer

It can extinguish gas-powered lighting used by maintenance teams

Answer

It improves ventilation, reducing heat-related risk for track workers

Answer

It only affects workers within 1 metre of the running rail

Question 5

If a worker feels unwell or becomes injured while working inside a long tunnel, the FIRST priority is:

Accepted Answer

Call the signaller and request the tunnel is cleared of trains, then assist the worker to the nearest refuge or tunnel entrance

Answer

Continue working to avoid delaying the job

Answer

Send the worker to walk out of the tunnel unaccompanied

Answer

Wait for the next planned train path to pass before evacuating

Question 6

Which statement about lookout warning systems in tunnels is CORRECT?

Accepted Answer

Warning distances may need to be extended inside tunnels because sound travels differently and sight lines are limited

Answer

Standard audible horns are always sufficient warning inside any tunnel

Answer

Tunnels are always protected by automatic train protection so no lookout is needed

Answer

Lookouts are not required in tunnels shorter than 500 metres