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Post by domh245 on Jul 25, 2014 19:53:24 GMT
AFAIK, whenever there are overuns, and the driver has to resort to emergency open mode, they will always cut out the first and last 4 doors, regardless. What would be better is if the train had sensors mounted underneath the length of the entire first car so that the train can determine by how far it has overshot, and release doors as applicable, so that there aren't any cases of 2 cars being lost because of a small overrun.
I'm thinking of something where the first doo-dah (technical term) arms the door and the last doo-dah dearms it. It would be as simple as just placing the doo-dahs at the platform limits, and fitting a sensor under each door, and a clever bit of coding, although unfortunately, the boat has long since sailed on suggestions to improve the trains, and so we won't see any real changes until either the train has it's mid-life refurbishment/rebuild or the next generation of SSL stock is introduced.
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Deleted
Deleted Member
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Post by Deleted on Jul 25, 2014 19:58:48 GMT
Doo-dah's the correct technical term? What's a deely? Don't tell me I've had those two mixed up all these years!  |
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North End
Beneath Newington Causeway
Posts: 1,769
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Post by North End on Jul 25, 2014 21:21:28 GMT
AFAIK, whenever there are overuns, and the driver has to resort to emergency open mode, they will always cut out the first and last 4 doors, regardless. What would be better is if the train had sensors mounted underneath the length of the entire first car so that the train can determine by how far it has overshot, and release doors as applicable, so that there aren't any cases of 2 cars being lost because of a small overrun. I'm thinking of something where the first doo-dah (technical term) arms the door and the last doo-dah dearms it. It would be as simple as just placing the doo-dahs at the platform limits, and fitting a sensor under each door, and a clever bit of coding, although unfortunately, the boat has long since sailed on suggestions to improve the trains, and so we won't see any real changes until either the train has it's mid-life refurbishment/rebuild or the next generation of SSL stock is introduced. I presume the system would default to the most restrictive scenario, which is having the maximum number of doors inhibited. Having said that, the 1995 stock does not do this. Whilst the Train Operator has the ability to cut out the front set of doors, which would be done for a minor platform overrun or at the small number of platforms where the front doors remain closed, the T/Op has no means of cutting out the rear doors. Therefore, in the event of having to use CSDE Override at Euston s/b City, for example, there is no convenient way of keeping the rear doors closed. The difference is, however, that with the 95 stock I don't believe there are any locations where the doors would inadvertently open actually in the tunnel - in all cases it is simply a narrow section of platform. Presumably on this basis the risk is considered to be sufficiently minimal. Under the old signalling, the semi-official workaround advice was to drive the train a short distance in to the tunnel so that the last doors were now fully berthed, and then cut out the front doors to compensate. However I can't imagine anyone actually doing this, and in places where the starting signal was close to the platform and potentially showing a red aspect, it wouldn't be feasible anyway. Under TBTC it's not feasible as the train will not get a new target point until the system has seen the doors open, so the only way to move the train forwards would be in RM. |
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Post by Dstock7080 on Jul 25, 2014 22:55:36 GMT
Trying to get to grips with this thread, D Stock and S Stock use different CSDE equipment.
As the notice at East Putney was not Stock specific it should probably only affect D Stock, hence the S Stock equipment was not affected.
The 'emergency open' procedure on S7 Stock is as described by domh245 above except it is only the first and last 3 doors (S8 is 4 doors) that will remain closed, this is the most restrictive, as suggested by North End.
On S Stock the driver is unable to cut-out the leading or rear doors manually, this is all done by SDO (Selective Door Opening)
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