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Single line working using tokens

93 bytes added, 20:01, 19 November 2017
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== The Token Instruments token instruments ==
[[File:HYTokenInstrClose.jpg|thumb|200px|right|Close-up of a token instrument, with telegraph needle at the top, and indicator, commutator and bell plunger below.]]
[[File:TokenCarrier.jpg|thumb|200px|right|A token in a carrier.]]
When the train arrives at the second signal box the crew will hand the token, in its carrier, to the signalman there. When he or she has seen the tail lamp on the back of the train, to prove the whole train has cleared the section, he or she will place the token in their instrument, put their indicator to normal, and send the "Train Out Of Section" bell signal to the sending signalbox.
== Crossing Trains trains ==
When two trains are passing each other at a signalbox, the sequence of operations is slightly more complex. This is because only one train is allowed to enter the crossing loop at once, to minimise any risk in the rare chance that either train overruns any signal.
Crossing trains in this way is only done at two stations on the SVR: [[Arley]] and [[Hampton Loade]]. Although trains can also pass each other at [[Bewdley]], this is not technically 'crossing trains' as described here, because Bewdley station has a stretch of double track between its two signalboxes, signalled using the [[Absolute Block]] regulations.
== Equipment Failure failure ==
If the token instruments are not working properly, so that tokens cannot be taken out of the instruments, the safety of trains is maintained by appointing a member of staff as a 'Pilotman'. He takes the place of the tokens, by travelling back and forth on the footplate of each train according to the signalmen's instructions. Because tokens are not being withdrawn from the token instruments the section signals remain locked at Danger, so the Pilotman, under the signalman's instructions, tells the traincrew when it is safe to pass these signals at Danger.
The Pilotman can be identified by a red armband that he must wear at all times. Strictly speaking, Pilotman working is closer to the 'staff and ticket' working [[Single line working using tokens#History|described above]] that to token working. If more than one train will be travelling in the same direction, the Pilotman will write out a 'Pilotman's ticket' for the first train(s) to carry, and will travel on the last one.
== See Also also ==
*[[Acceptance Lever]]
*[[ETT]]
*[[Absolute Block|Absolute Block on double lines]]
==References==
 
<references />
 
==Links==
[http://www.svrsig.org.uk/ SVR S & T Department]
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