Why did the DLR decide to go with Docking Points rather than this system?
The DLR was pre CSDE! I would imagine that door control on DLR is all tied in with computer operation but I don't know anything really about DLR signalling and control and I have no idea what a Docking Point is.
Always a company man, just an old 'hasbeen' now preparing to be a new 'was'. I doubt that anyone under 45 will understand the remark!
How wide is the loop at stations on the JLE extension?
There were two types of CSDE loop, the standard loop when installed to the basic spec is 5.6M and the short loop is 3M. However, the length and height of the loop are adjustable within the limits of the specification to fit sites so they may appear longer than 3M but not longer than 5.6M.
Of course what I am quoting is the original spec which is now 20+ years old. However, the length and height of the loop aerial and its proximity to surrounding metalwork will affect the signal and the signal transmitter has coarse and fine adjustment of power level to provide a comparable signal strength at each site.
The Jubilee line uses (used?) a PAC device similar to that on the Central line.
It's dealt with in the ATO data. One of the last few lines of code the train is given at each station is the CSDE information, either left/right/both/none.
So if a Central Line train arrives at a platform and the wrong side doors open there is a fault with the train equipment?
No - we try very hard to get that bit right! The control over the doors is still exercised by the Train Operator who can still override the CSDE. After the last wrong side opening incident I was involved in it became clear very quickly that the CSDE was being overridden.
It is over a year since the incident occurred for which I was seeking info so hopefully any repercussions will have taken their course.
Ruislip Gardens 1147 a Central Line train arrived from the west (I don't know if from the depot or West Ruislip). After a delay the wrong side doors opened. Then the right side doors opened. Then the wrong side doors closed. The train operator asked passengers on the platform and was surprised when told the wrong side doors had opened. He then came on the PA saying he had broken the train and it was going out of service. With the aid of a member of station staff they checked no one had fallen out of the wrong side and eventually it disappeared eastbound.
With all the built in safeguards any thoughts on how/why this happened?
two reasons for a wrong side opening usually- equipment failure or human failure. most likely is the train stopped in slightly the wrong place and therefore outside the csde zone or the csde was defective. the driver then has to operate a manual override in the cab and then open the doors. at this point its all down to the driver to ensure the correct doors are selected. in this case and i've no knowledge of the incident sounds as though the wrong doors were opened panic set in as it was realised then the correct doors opened before the wrong doors were closed- hope you're following that! the track search prior to movement is standard procedure following such an incident the train would have gone empty to a depot or until a fitter ok'd it unless there was a suspicion that the train was faulty- the equipment failure reason. it has been known for the driver to select the correct doors but the wrong side to open due to faulty wiring or electrical feeds- this however is extremely rare. hope this reply is of use