DEFINITIONS / PRINCIPLE Flashcards
1
Q
Signal section:
A
The line between two stop signals, whether or not these are within the control of the same signal box.
2
Q
OVERLAP
A
The distance beyond a stop signal up to which the line must be clear before the previous signal can show a proceed aspect.
3
Q
PRINCIPLE
A
The track circuit block system allows a signal to show a proceed aspect when:
• all track circuits, up to and including the overlap of the next stop signal, are clear
• all necessary points within the route are detected in the correct position for a train to pass safely.
4
Q
PRINCIPLE OF SLW
A
When one line of a double line becomes blocked.
SLW by pilot allows trains to travel over the other line in either direction.
