The First Principles of Railway Signalling Including An Account of the Legislati
The First Principles of Railway Signalling Including An Account of the Legislati
C B Byles
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On the other hand as a train after completing its work at the siding must necessarily be accompanied by the train staff" or tablet there is no risk of the train-men inadvertently going away and leaving the points in the wrong position. It is obvious that this arrangement cannot be employed at junctions where a train may have to leave the direct route altogether nor, under ordinary circumstances, at points at which trains have to be shunted for others to pass, as under such circum- stances after... the train had been placed clear of the main line, the staff would have to be taken by hand to the nearest staff station. It should be added, however, that supplementary apparatus has been devised whereby the shunting of trains on single lines at other than staff' stations can be effected. The use of such apparatus raises questions of method and equipment which it is hardly necessary to enter into in discussing first principles. On single lines worked by the staff and ticket system, intermediate siding points if locked by the staff' are perfectly safe and no signals are actually necessary, but, of course, the siding could not then be used by a train carrying a ticket.
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