class411
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Post by class411 on Apr 2, 2024 12:24:32 GMT
Apologies class411 original post now updated. Thanks.
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class411
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Post by class411 on Apr 1, 2024 22:45:39 GMT
They are going normal speed eastbound but slower westbound I’m confused now. You mention a TSR1, White City to Shepherd’s Bush, which is eastbound, but now say they are going slow westbound. ( I noticed the low speed whilst on the platform (on several occasions), and have not been westbound for a while.
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class411
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Post by class411 on Apr 1, 2024 18:21:30 GMT
As we all know it, the caxton curve. The TSR between White City and Shepherd's Bush is a TSR 1. It's the 'lowest of the low'. I believe a TSR1 is around 14-20kph? The rest are TSR3's which are around 33kph. Even before the speed restrictions, there's a 25kph speed limit due to the curve just after the tunnel mouth. It's a 33-35kph speed limit after it's gone over the curve I believe, happy to be corrected. However this thread isn't for discussing TSRs as there's already a thread on that So am I interpreting this correctly, if I take it to mean that, yes, the trains are going slower at the moment that usual?
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class411
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Post by class411 on Mar 22, 2024 15:11:48 GMT
Bearing in mind that it is a safety critical system. I tend to concur with the failsafe principle being employed when an unacceptable/unexpected condition has occured. The term "software crash" may not be a suitable description - one would expect the system to go into a "protected state", hopefully giving error messages and requiring some intervention to resume/reset/ignore. On the railways, "I'm sorry Dave, I can't do that", is acceptable, given an unsupported exception condition. On an Airbus, less so.
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class411
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Post by class411 on Mar 17, 2024 11:17:38 GMT
I’ve noticed this weekend that trains are entering the eastbound platform very slowly - certainly much slower than usual.
Does anyone have any idea why?
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Post by class411 on Mar 13, 2024 7:08:10 GMT
As no one has answered after 14 hours, could you clarify which lines you are talking about?
The HC & C only have one pair of platforms, which they don’t share with any other line.
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class411
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Post by class411 on Feb 24, 2024 14:53:04 GMT
No, there are plenty that run via Victoria.
It's very common that I have to skip one whilst waiting to go to Hammersmith.
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class411
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Post by class411 on Feb 24, 2024 4:57:06 GMT
I believe the loss of passenger door proving only automatically cuts traction - it is then down to Train Operator to decide whether to "actively stop" or not.An exception may be if any part train is still within the platform area. There is a Remote Condition Monitoring and trend analysis/report system on the central line trains which should pick out any pattern of regular occurrences of faults such as this at a location or with certain trains. Otherwise there are acknowledged "random occurances" related to the system design (eg code stepping/ripple and code gaps at track boundaries) which are not economically resolvable There is no deciding about it loss of pilot light/doors closed visual you STOP the train. If you have time, presumably. With a passenger leaning on a door, would you have time to react?
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class411
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Post by class411 on Feb 19, 2024 17:56:11 GMT
Was there a very high rate of deceleration?
When I was on a train that emergency braked, there was no doubt as to what happened.
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Post by class411 on Feb 7, 2024 23:10:59 GMT
Apologies, I thought my mention of S stock CSDE both sides would have made it obvious there is a platform both sides of the same track. My fault. I didn’t read the post properly.
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class411
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Post by class411 on Feb 7, 2024 12:36:04 GMT
Thanks. I knew there must be an explanation other than the driver getting out and changing the points as if she or he were in a cartoon.
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Post by class411 on Feb 7, 2024 10:00:54 GMT
Signs there tell T/Ops to use platform 3 I'm confused! How can the driver decide where the train goes?
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Post by class411 on Feb 3, 2024 9:27:52 GMT
I think I have explained it with the word independent where I said there are enough independent parts for wear differential to occur. I don't know a clearer form of words . It’s obvious that with any friction interface, wear will lead to synchronisation problems, and no simple adjustment is possible. But why not use a toothed handrail so that it could be locked to the step drive with gears? I’m guessing some potential safety problem.
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Post by class411 on Feb 1, 2024 2:37:12 GMT
If the bottom of the handrail were toothed, you wouldn’t need a friction element, but presumably there are goood reasons why this is not possible.
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Post by class411 on Jan 15, 2024 12:06:30 GMT
Tfl are desperate to generate more income and are trialling a new strong password generator.
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Post by class411 on Jan 14, 2024 14:53:29 GMT
The journey planner does some really weird things.
I meant to post this at the time, but forgot, so I can't remember the precise details now, but it was something like this.
I wanted to get to Heathrow at stupid o'clock (~6 IIRC) from Shepherds Bush.
The journey planner suggested that I get up at three, catch a bus to Ealing, and then get the Heathrow Express. It looked as if the journey had been optimised for their profit.
I did a quick check to ensure that the HC&C and Piccadilly were running, and left at five to easily get to Heathrow on time using the obvious route.
On other occasions it's insisted on giving me weird and wonderful routes, with multiple changes and bus journeys, when there are perfectly good, simple, underground ones available.
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Post by class411 on Dec 31, 2023 23:11:01 GMT
Victoria (sponge).
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Post by class411 on Dec 22, 2023 9:59:48 GMT
It will depend on how much tolerance the PEDs have. Looking at the quoted figure, there could be a difference of 1.4m between two different arrivals. I doubt the PED's would have that much latitude. I did see a very significant train/PED mismatch in Europe once. It was a very odd thing to see.
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Post by class411 on Dec 21, 2023 3:13:31 GMT
So this stock is incompatible with platform doors?
Or can that be solved by a software alteration and better positional feedback?
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Post by class411 on Dec 19, 2023 15:34:38 GMT
That's a very good point, which probably answers the question.
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Post by class411 on Dec 19, 2023 11:41:28 GMT
Thanks, Chris.
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Post by class411 on Dec 19, 2023 11:24:33 GMT
Apologies if this has been asked before, but it's not an easy thing to search.
What is the allowed margin of error when an S Stock train stops in a station?
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Post by class411 on Dec 19, 2023 11:22:03 GMT
Does anyone know why there is a train describer for westbound services on the upper concourse, but not one for eastbound?
Or have I just gone blind?
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Post by class411 on Dec 8, 2023 21:00:38 GMT
Over the last few days I’ve heard of this happening on Eurostar and NR, and I saw a dead train on the approach to Victoria (NR) today.
I haven’t yet heard of happening on LU.
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Post by class411 on Dec 7, 2023 14:26:02 GMT
I've seen several of his videos and found the useful and informative.
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Post by class411 on Nov 17, 2023 10:02:02 GMT
Are there any plans to renew the moquette on these trains soon? The seats are looking rather worn now. The moquette used was very poor quality compared to the traditional Underground material. Is that the way they are going, now, or was it a blip?
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Post by class411 on Nov 13, 2023 10:34:44 GMT
It seems that Sonia is going to have a rather deep voice.
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Post by class411 on Nov 2, 2023 11:53:24 GMT
Interesting that a strike can shut down the whole of a fully driverless train system, whilst TFL always seem to manage to keep at least some of it running when there are strikes.
And, yes, I do understand why that is.
It's just that it should be an eye-opener to anyone who thinks that a driverless train system would be immune to strike action.
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Post by class411 on Oct 28, 2023 12:22:52 GMT
Just so I can be more careful on some other occasion, what range might be considered reasonable as "a few years ago" I wonder? In my experience, the older I get the longer "a few years ago" encompasses. I used it this morning in reference to something that happened circa 20 years ago, something I never would have done 20 years ago! I think our memories work on a logarithmic scale. Whatever age you are, 10% of your life is perceived as the same duration. So by the time you finished primary school, your time there would be almost your entire remembered life. And the six/seven years of secondary school which were ~30% of your life seemed to last an enormous length of time, whereas 6 years at the age of fifty is perceived as relatively far less. If you manage to make it to ninety, the years 80-90 would be the same proportion of your life as two years at the age of eighteen.
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Post by class411 on Oct 27, 2023 8:32:29 GMT
Walking through Victoria (LU) yesterday, I remembered that, from the seventies until a few years back, there was a doorway, close to the steps leading to Victoria NR, from which the smell of cooked food frequently emanated. There was no signage, and I was never close enough, when anyone entered or exited, to see inside. The whole area has changed so dramatically that it's all but impossible to visualise its previous state. Can anyone say if there was a staff canteen in that location? Yes there was one there, the entrance door was on the left just before ascending the stairs to the Kent side of the main line concourse. It was a BR canteen, very useful when working at Victoria, but I can’t remember when it closed. I will try to remember to check the door’s location next time I am passing through Victoria. That's the one. It's completely changed now, of course. What were rooms are now part of the open concourse. One of the reasons (apart from the cooking smell), that I assumed it was a canteen was that the doors were very obviously not locked unlike other 'staff only' doors.
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