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In an emergency, you must;
Contact the ( signaller, colleagues near you, the boss ) or ( ECO, COSS )
Connect a ( Track circuit operating clip, Detonator, ATWS ) between the running rails (except ( in fourth rail areas, in third rail areas, in OLE areas ))
Walk towards trains for ( 2km, 1.5m, 3km, 10m ) and place ( three, four, two ) detonators on the rail ( 20m, 10m, 5m, 30m ) apart
Move at least ( 30m, 20m, 10m ) from the ( detonators, Track circuit operating clip, COSS )
Display a hand danger signal to ( approaching trains, leaving trains, signaller ) from ( a position of safety, inside a refuge, inside a tunnel )