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HOW THEY DEVELOPED
THE BLOCK SYSTEM
THE SIGNALMAN AT WORK
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accepted accident Advanced Starter apparatus Automatic Train Control ballast train Basildon signal bell block instrument box ahead box in advance box in rear brake branch line train British Railway circuit collision colour colour-light signalling crossing loop crossover derail detonators Distant signal driver electric engine crew facing points fogman following train green Home signal illuminated track illustration indication junction light line clear lock locking-bar London London Midland Region miniature levers moving normal Northallerton operated Outer Home Pangbourne passenger train platform plunger position practice RAILWAY SIGNALLING ramp relay interlocking running lines running rail searchlight second train seen semaphore signal shown shunt movements siding signal arm signal-box signalman signals and points single line sometimes speed staff Staff and Ticket station stop signal switch tappet time-interval time-table track diagram track-circuiting traffic trailing points train crews Train on line train passing Upper Quadrant upper-quadrant warning yards yellow