| Attribute |
Scope |
Type |
|
axle
|
Public
|
|
|
Notes:
|
a system using counting points and a counter which detects the occupancy of a section of track by comparing the number of axles which enter the section with the number of axles which leave the section, parity of the numbers being necessary to give a clear indication.<br/>
|
|
|
endOfTrain
|
Public
|
|
|
|
|
train
|
Public
|
|
|
Notes:
|
Train-borne positioning systems are a feature of modern Communication-Based Train Control systems (which often use moving block technology). These systems rely on the train regularly reporting its location and other information to the control centre, for which of course it requires a reliable communication link [Paul Darlington and David Fenner Train detection – the basics]<br/>
|
|
|
wheel
|
Public
|
|
|
Notes:
|
the track circuit confirms the absence of a train to the signalling system (track circuit clear). The presence of metal wheels and axles of a train within the track circuit boundaries will cause the rails to be ‘short circuited’ [Paul Darlington and David Fenner Train detection – the basics]<br/>
|
|
