Line blockage Flashcards
1
Q
First train over the affected portion of line, what must you do? (2)
A
- You must specially watch the operation of the track circuits during the passage of the first train over the line that was affected by the possession.
- you must not allow a second train to pass over the line that was affected unless there is a controlled signal which you have replaced to danger between the first and second trains.
2
Q
A T-COD can only be used if all the following conditions apply (3)
A
- Use at a particular location is authorised by the Sectional Appendix.
- The signalling equipment is working normally at the time the T-COD is to be placed on the line.
- The work will not affect the correct operation of the track circuit concerned.
3
Q
TCOD- when protection provided, you must (2)
A
- check that the track circuit concerned is showing clear.
- You can then give permission to the COSS, IWA or PC to place the T-COD on the line.
4
Q
When the COSS, IWA or PC tells you that the T-COD has been placed on the line, you must - (3)
A
- check that the track circuit is showing occupied
- Confirm track circuit is showing occupied to the COSS/IWA/PC
- Grant line blockage
5
Q
COSS confirms ready to give up line blockage, you must - (2)
A
- Check track circuit where TCOD had been applied that it is showing clear.
- If not clear, check with the COSS that the TCOD has been removed or deactivated.
6
Q
If additional protection is to be provided by disconnecting signalling equipment, you must - (3)
A
- Agree necessary disconnections with signalling technician when signal protection has been provided.
- You must tell the COSS when the disconnections have been made.
- You must arrange for the signalling technician to make the necessary reconnections after the line blockage has been completed or suspended.