Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 29, 2012 8:50:35 GMT
At the two Jubilee stations I use regularly (and I presume at all the others), there is an indicator to show platform staff when the train is ready to leave.
I had assumed that this indicator was driven by the signalling system such that when the train was given permission to proceed the indicator would light. However at London Bridge eastbound on three occasions I have observed trains departing when the indicator is not lit. On all other occasions it has been lit.
Please could someone describe how this indicator works
Thanks
|
|
|
|
Post by punkman on Oct 29, 2012 19:36:38 GMT
From what I understand the London Bridge ones had been broken of late (or not working in sync).
Your assumption is correct, although there are occasions when it works the other way in that it will light before the driver gets his or her target point i.e. when the train ahead is not sufficiently far off e.g. the Southwark one will light if the system thinks its time for train B to depart even if train A ahead is still in Waterloo and as a result too close for train B to proceed out of the platform.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 29, 2012 21:21:41 GMT
Overall it is generally a reasonable indication of a train about to leave but is not linked directly to the train's actual movement authority. As the OP notes a train can depart without the indicator being lit at all.
It lights 11 seconds before the train's dwell countdown is due to expire to give station staff time to do platform duties and the train to leave on 0 seconds dwell. However, the system isn't perfect - if calling the route takes longer than predicted it will be lit for too long or the train get's its dwell time cut whilst at the station for example the RTDI (ready to depart indicator) won't have time to light. Also isn't perfect at locations like Stratford where a train can get a partial route allocated out of the platform but won't actually leave until it has a completely clear route (in this case the RTDI lights too early).
Now that the overall TBTC system has settled down this aspect of the system will be reviewed to see if it can be improved a bit.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 30, 2012 7:45:16 GMT
Interesting thank you
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 30, 2012 18:30:05 GMT
A perfect example of this is at Canary Wharf. The light will illuminate on the platform but the driver will not get a target point until about 4 seconds later (Eastbound).
Another example is at Kilburn on the southbound.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 23, 2013 22:04:50 GMT
Is it possible for the ready to depart indicator to be lit, when a departure route from a terminus has not yet received any movement authority (red light)?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 24, 2013 13:24:29 GMT
Is it possible for the ready to depart indicator to be lit, when a departure route from a terminus has not yet received any movement authority (red light)? Surely the 'RTD' would only light once the route had been set and cleared by the computer? Rather like the sound on the DLR to tell the train captain that the road ahead is clear. That's my understanding anyway. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 25, 2013 21:06:21 GMT
Is it possible for the ready to depart indicator to be lit, when a departure route from a terminus has not yet received any movement authority (red light)? Surely the 'RTD' would only light once the route had been set and cleared by the computer? Rather like the sound on the DLR to tell the train captain that the road ahead is clear. That's my understanding anyway. Is it the same as the DLRs RTD though? Interested to know the answer, as initiating door closing ahead of a green light/movement authority, could potentially increase terminus capacity. |
|
