The CD switch on the platform causes the illumination of the CD indicatotrs which then inform the driver to close the doors; the driver therefore operates the control actually to implement this function.
Hence yes there are in a sense two operations, but only one associated with the CD indicator.
On automatic railways, it is actually often left to the driver / train captain to close the doors even though all other operations entirely automated. However there are railways which are truly fully automatic with no staff on the train and therefore the train dispatch has to be automated. I am not awre of any specific site, but it would not surprise me to find that on certain systems it could be an input from platform based staff that trigger the doors closing and subsequent departure. Otherwise if the platform has platform screen doors and /or some intrusion detection it would be possible to completely automate.
For the last part, indeed you are correct- the platform dispatch staff do need to check the signal aspect and this is generally the reasn why one or more OFF indicators are provided to enable them to do so from one of a number of reasonable positions along the length of the platform
Hence yes there are in a sense two operations, but only one associated with the CD indicator.
On automatic railways, it is actually often left to the driver / train captain to close the doors even though all other operations entirely automated. However there are railways which are truly fully automatic with no staff on the train and therefore the train dispatch has to be automated. I am not awre of any specific site, but it would not surprise me to find that on certain systems it could be an input from platform based staff that trigger the doors closing and subsequent departure. Otherwise if the platform has platform screen doors and /or some intrusion detection it would be possible to completely automate.
For the last part, indeed you are correct- the platform dispatch staff do need to check the signal aspect and this is generally the reasn why one or more OFF indicators are provided to enable them to do so from one of a number of reasonable positions along the length of the platform
(30-10-2012, 12:33 PM)jenni.joseph9 Wrote: Hi,
Thanks a lot for the detailed explanation.
I have a small query in the part which you have explained.
Does the Platform staff operate the CD Key Switch which is on the Platform first before the Driver operates the one which is on the train? If so, are there 2 opearations need to be done for CD, like one by the Platform staff and the other by the Driver on the Train.
Also to opearate CD, Signal should be cleared and if the Signal is not visible to Platform staff, do they operate the CD switch by observing the "OFF" Indicators which are present and lit on the platform once the signal is cleared.
Please correct me if am wrong.
Regards,
PJW