Part of my post is missing and I cannot seemingly add to it. So, I'll try to post one paragraph at a time...
The benefit of the CD and RA indications is to the DOO driver. They are not always able to look out of the cab and where they can, it may distract them from observing the signal's aspect - increasing the SPAD risk. If you observe where the CD and RA buttons are on a platform, they are not always in a position where the platform staff can see the front of the train - one of the requirement is that platform staff can see all doors from the dispatch point OR require further staff to enable them collectively to see all the doors. One of their checks is to ensure no-one is caught in the doors before giving "RA".
New Street is a good example where there is a mixture of crewed and DOO trains disptached from curved platforms as is London Bridge. It is worth reading the RAIB report referred to earlier and then watching the staff dispatch a train.
Arguably, these indications are not safety critical as they merely aid the driver.
* The platform staff should not try and dispatch the train without a proceed aspect.
* The driver should not try to move the train without the doors closed, the door proving indication lit and a proceed aspect.
* The CD indication is simply related to closing doors.
* RA is proved within the signalling system to not display unless a process aspect is given first, i.e. the signal is off.
* RA doesn't give the driver authority to move, the aspect does!
Discuss?
The benefit of the CD and RA indications is to the DOO driver. They are not always able to look out of the cab and where they can, it may distract them from observing the signal's aspect - increasing the SPAD risk. If you observe where the CD and RA buttons are on a platform, they are not always in a position where the platform staff can see the front of the train - one of the requirement is that platform staff can see all doors from the dispatch point OR require further staff to enable them collectively to see all the doors. One of their checks is to ensure no-one is caught in the doors before giving "RA".
New Street is a good example where there is a mixture of crewed and DOO trains disptached from curved platforms as is London Bridge. It is worth reading the RAIB report referred to earlier and then watching the staff dispatch a train.
Arguably, these indications are not safety critical as they merely aid the driver.
* The platform staff should not try and dispatch the train without a proceed aspect.
* The driver should not try to move the train without the doors closed, the door proving indication lit and a proceed aspect.
* The CD indication is simply related to closing doors.
* RA is proved within the signalling system to not display unless a process aspect is given first, i.e. the signal is off.
* RA doesn't give the driver authority to move, the aspect does!
Discuss?
Le coureur