Knowledge and understanding
Understand all associated hazard knowledge
The official name for detonators is ‘signal, railway track, explosive’. They were previously referred to 'fog signals' or 'railway for signals'. Detonators are small explosive devices used to warn drivers to stop immediately if there is a hazard further along the track.
Detonators may be found in a secure location in the driver's cab of a rail vehicle, or in secured buildings. They may present an explosive and projectile hazard if detonated, and personnel should maintain a distance of 30m from them; this distance will need to be adjusted if there are a large number of detonators.
As detonators have to be loud enough for a driver to hear from inside the rail vehicle, they may also present a noise hazard when detonated.
For further information refer to the RSSB publication, Guidance on 'Signals, Railway Track, Explosive' (also known as 'Detonators')