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Post by firestorm on Apr 18, 2024 20:29:39 GMT
A small video of 1973 tube stock PCM testing at work, not by me but it was uploaded to the company portal and thought a few people would appreciate the sounds.
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Post by firestorm on Jan 29, 2024 17:31:48 GMT
Just a lino repair, most likely due to area "bubbling" and causing a potential trip hazard. No services can be accessed via the flooring.
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Post by firestorm on Jun 1, 2022 23:15:20 GMT
graeme186 had determined the location of the fault, turns out the stabilisation rod that sits on top of one half of the intercar gangway had become damaged; this rod acts like a damper.
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Post by firestorm on May 10, 2022 14:30:00 GMT
The depot is now aware and it is under investigation.
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Post by firestorm on Apr 27, 2022 18:03:03 GMT
I have it on good authority from test crews that S8s have been and are going to Upminster for both reasons. Trains are indeed being sent to Upminster wheel lathe to help get the fleet back up to speed.
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Post by firestorm on Apr 16, 2022 16:36:38 GMT
On average every 230,000km before a S8 visits the wheel lathe so that equates to about 1.5 years. Under normal circumstances, it takes about a week to cut all the wheels. At the moment there are 2 checks taking places, a "LT5 wheel gauging" which is the quicker process and gives you an idea if a wheelset passes or fails e.g. flanges/tread depth. The 31 trains would have passed this. The other check is a lot more involved and is called "miniprof", this gives a high precision and accurate profile of the wheel. Even though a wheel fails the wheel gauging, the results from the miniprof will be used to decide whether a train can continue to run, as long as it is still within engineering specs and tolerances. This is a simpliflied overview of course, there are many measurements/data which is taken into account to ensure it is still safe to run. An example would be the tyre on your car, it hasn't quite reached the 1.6mm legal limit so you can still use it, but you would re-check it more often. Thanks for the informative posting. Would you know if it is technically possible to turn an S8 at Upminster or Ealing Common ( _ NOT going into the issues of how one would get there operationally) ... or is it that those depots lathes are fully occupied with S7 work ? Normal S8 running then is 1.5 years for 59 units at 1 a week is approaching - in practical terms - continuous throughput always of one per week. 133 S7 assume split 50:50 comes out about the same throughput - well ~66 is the same order of magnitude as 59 - so I assume there is no spare capacity at the S7 depots to do S8 work without compromising the S7 fleet ? Or, to ask that question, are any S8 being dealt with at the S7 depots ? Technically, yes they can be turned at any depot. Although the wheel lathe at Ealing has long been decommissioned and is now concreted over (wheel lathe taken out first and then concrete poured in, not just over the wheel lathe). But no, S8 currently being dealt with at Neasden.
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Post by firestorm on Apr 15, 2022 0:34:43 GMT
So if there are ?59 S8 trains, and 31 'good' trains, that would suggest that almost half the S8 fleet passed through the wheel lathe in question in a short space of time, assuming the problem was spotted quickly. How often do trains get their wheels adjusted? I guess with the intensity of use, and current track infrastructure, it is quite often! I think the S8 fleet is set at 58 trains with the spare train reduced to an S7 for additional capacity on the District/Hammersmith or Circle services. There is actually 59 trains in the met line fleet list, the additional one being the s7+1 u21324. This train remained as is with the flexibility of being changed back into a s7 if need be, although I don't see that happening in the near future.
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Post by firestorm on Apr 14, 2022 19:31:21 GMT
So if there are ?59 S8 trains, and 31 'good' trains, that would suggest that almost half the S8 fleet passed through the wheel lathe in question in a short space of time, assuming the problem was spotted quickly. How often do trains get their wheels adjusted? I guess with the intensity of use, and current track infrastructure, it is quite often! On average every 230,000km before a S8 visits the wheel lathe so that equates to about 1.5 years. Under normal circumstances, it takes about a week to cut all the wheels. At the moment there are 2 checks taking places, a "LT5 wheel gauging" which is the quicker process and gives you an idea if a wheelset passes or fails e.g. flanges/tread depth. The 31 trains would have passed this. The other check is a lot more involved and is called "miniprof", this gives a high precision and accurate profile of the wheel. Even though a wheel fails the wheel gauging, the results from the miniprof will be used to decide whether a train can continue to run, as long as it is still within engineering specs and tolerances. This is a simpliflied overview of course, there are many measurements/data which is taken into account to ensure it is still safe to run. An example would be the tyre on your car, it hasn't quite reached the 1.6mm legal limit so you can still use it, but you would re-check it more often.
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Post by firestorm on Dec 12, 2021 21:12:54 GMT
The general feeling among staff is the worst cast scenario of an e-scooter going off on in a tube train inside a tunnel. There's been several previous incidents related to smoke inside carriages and there has been panic. The video of the s-stock at parson's green just showed the amount of smoke from that single e-scooter. Thankfully like it was mentioned before, the s-stock has walkthrough carriages and the HVAC system can open the vents to vent out smoke. Other rolling stock don't have any of these so it's quite a good thing that Tfl are being pro-active, instead of waiting for an incident to occur.
It is also said, smoke is more dangerous than fire.
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Post by firestorm on Dec 11, 2021 17:42:26 GMT
After 3 months, is the train back in service with a new battery? Or what's happening? The train is back in service as of the 16th Nov after having both batteries replaced.
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Post by firestorm on Sept 17, 2021 20:24:26 GMT
After a week, is the train back in service with a new battery? Or is this a job for Derby to fix up? Train is out of service to find the cause of the battery fire. Trains are well out of warranty, so BT won't be touching it.
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Post by firestorm on Jul 17, 2021 17:32:52 GMT
The doors system in a quick and simplified way is made up of relays and hard wired controls, once the appropiate beacon signal is gained it allows the correct doors to open. This is different to the system that controls the "doors not in use" panel, which is controlled solely by the train control management system (TCMS), without going into too much depth, it uses something called a Modular input/output or MIO to turn on/off. TCMS is software and there are quite a few components which is connected via the digital output e.g. outer door indicator lights (ODILS), audible alarms in the cab and even the lights for when the door open buttons are pressed in the cab. When you start involving software, it starts to get rather complicated, however you may have noticed all the systems I have listed above aren't safety critical systems or anything that would stop the train from being moved. Apart from a few train tests that rely on the MIO to operate, it's essentially a nice to have information system. Or the train may be on the mark but not picking up the signal from the beacon for some reason, also flashes on when the train is opened up, just until it realises where it is. hmm... the more the technology, the more there is to go wrong! Whilst that is true there is enough redundancy built in, so that key systems will continue to work to not leave a train stranded even if multiple systems fail.
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Post by firestorm on May 17, 2021 18:04:55 GMT
I always understood that Neasden can undertake some work that neither Ealing or Upminster can’t? This is correct, from observation the test train operators take these trains to and from the depots running under the service number in the 7xx's.
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Post by firestorm on Mar 15, 2020 12:56:09 GMT
At the maintenance depot I work at, everything is business as usual, there's one person who is self isolating as per health guidance. Overall there shouldn't be too big an impact with trains being being prepped and maintained, worst case they'll have to loosen the purse strings and call people in for overtime.
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Post by firestorm on Dec 24, 2019 17:40:22 GMT
This is where the S-Stock seems to throw every other normal rolling stock rules out the window. As Colin has mentioned with slight corrections, the auxillary converter module (ACM) is located on the second M1 car, this is probably one of the most important components on the train, it gets the 630V/750V from the leading DM (Driving motor) car, so it can convert the different voltages needed for the train e.g. 110v DC, 400v AC for the compressor (located back on the DM car). In a scenario where the front DM car is off juice so the ACM isn't running, but rear DM car is still on juice, the train goes into "bridging mode" where 400v AC can be supplied to the front compressor so effectively you have 2 compressors running off one ACM and vice versa. It is because of the way the S-Stock is designed, we can see major problems if both the front and rear DM cars are off juice, no active ACM's means no compressors. The middle cars being on current means nothing on a S-Stock, they are not connected to the ACMs in any way nor can be "bridged" to do so, their only purpose is to run their own and adjacent motor converter modules (MCM). The batteries are there to stop the train going into complete darkness and shutting down when the train is fully gapped, so if and when you are running on battery power alone, it's quite an urgent scenario. So in the scenario of: - Both driving cars off current - All middle cars on current - Sufficient main line air - Batteries not dead What stops an S stock moving? On something like a 95 or 96 stock the only thing would be load-shedding, and there's a solution to that. In this scenario nothing, the middle cars would easily give enough traction to move the train. But it's one of those worst case scenarios where you have a perfect storm of everything seemingly to go wrong at the same time.
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Post by firestorm on Dec 24, 2019 16:51:35 GMT
Gapping just the driving cars in reality isn't normally a major problem - as you will still have the middle motor cars on current which should be quite sufficient to get the train moving again. Losing the compressors isn't an immediate problem as the air is stored in reservoirs so there's no problem until this starts to deplete, and likewise the auxiliaries are fed by batteries so again this isn't an immediate problem. This is where the S-Stock seems to throw every other normal rolling stock rules out the window. As Colin has mentioned with slight corrections, the auxillary converter module (ACM) is located on the second M1 car, this is probably one of the most important components on the train, it gets the 630V/750V from the leading DM (Driving motor) car, so it can convert the different voltages needed for the train e.g. 110v DC, 400v AC for the compressor (located back on the DM car). In a scenario where the front DM car is off juice so the ACM isn't running, but rear DM car is still on juice, the train goes into "bridging mode" where 400v AC can be supplied to the front compressor so effectively you have 2 compressors running off one ACM and vice versa. It is because of the way the S-Stock is designed, we can see major problems if both the front and rear DM cars are off juice, no active ACM's means no compressors. The middle cars being on current means nothing on a S-Stock, they are not connected to the ACMs in any way nor can be "bridged" to do so, their only purpose is to run their own and adjacent motor converter modules (MCM). The batteries are there to stop the train going into complete darkness and shutting down when the train is fully gapped, so if and when you are running on battery power alone, it's quite an urgent scenario.
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Post by firestorm on May 29, 2019 21:35:11 GMT
I spotted a unit with a new type of inter-car barriers between two cars on an 8 car unit. They were made of rubber. I haven't seen any more units with this mod since a week ago. I think that plasmid was referring to the inter-car barrier that is made of synthetic material and held in place by shock cords. I've seen the rubber replacement as well, but that was a few months ago. Maybe they are testing out the new design, which would reduce the need to check that the existing ones are secured in place (3 customers were struck by a loose inter-car barrier at Mile End in 2009). I thought that rubber sharks-teeth were already in place when the incident at Holland Park occurred in August 2013, but they actually ended up being used as steps. After the Holland Park incident, additional rubber barriers were placed above the door, to make it harder to climb up between the cars? I’ve just seen unit 92168-93168 with the new rubber inter-car barriers that plasmid refers, apologies for initially doubting. Yes, fixed to each car with a small gap between. Was curious about this new intercar barrier and had a dig around, I assume this is what people saw? This was a trial back in august 2016 and it appears only this unit was ever fitted, can't find anymore information about it but looks like they were happy to leave it on. I think costs would have been a major factor in not replacing the entire fleet, furthermore the current intercar barriers have an inner safety lanyard fitted to the shock cords.
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Post by firestorm on May 18, 2019 16:26:00 GMT
Hello all, I'm wondering if anybody can shed some light on the S7 stock that was stabled at West Ruislip last week attached to tanker wagons? A YouTuber had stated it had been there for a few days at least and I'm curious as to why it was there. I presume it's something ATO related? Trains are still going and returning from Bombardier Derby for CBTC fitment, although that programme (started in August 2016) is almost over, with the last S8 about to return to London and just 4 S7s in London still not touched. As of Wed 15th May, the last S8 has returned from Derby with ATC mods, this ends the S8 modifications programme.
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Post by firestorm on May 18, 2019 16:17:19 GMT
The latest UNDERGROUND NEWS reports 21095/96 as long term stopped. Why and when was it last in service? u21096 has returned to service as of last week and you are correct it was a very long term stopped unit, last time I saw the stopped days it was in the 700+ days. It went up to Derby for ATC mods and was there for a while (over a year) came back and various issues were found, then it had bits "borrowed" from it and by then loads of maintenance was way overdue.
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Post by firestorm on Apr 6, 2019 12:04:08 GMT
This is what we have been told so far and I can only really talk about the s-stock fleet, but a report was carried out by an external company into whether extending checks would compromise safety and according to the report it would not. I haven't seen the report (it's quite a comprehensive one too), however another union has read it and can't dispute it.
The following checks will be done on the s-stock on a daily basis, tripcock test, HMI check, log book inspection and walk through. I'm sure there was a 5th one but cannot remember it. There won't be any job losses, but as we know LU are trying to save money and of course overtime comes into play if you don't need as many staff to prep the trains at night if the prep is extended. There is heavy overhaul coming up etc so staff will move onto other areas of maintenance.
This extended time between checks you can probably get away with on the newer stock, since the s-stock monitors itself and the control room techs (CRT) at Hammersmith are looking for potential issues but like as other people have said, whether this will work on older stock, I can't really speak for.
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Post by firestorm on Mar 17, 2019 14:24:40 GMT
Are you saying that the system does not have the capability of 'thinking': "I need to be at X point in n seconds, I'm m metres away, so I should be going at m/n metres per second? I’m only a driver and so don’t have that deep a technical knowledge of how the system works. All I’m saying is what I posted. Other lines with the same system seem to constantly coast-motor-coast-motor-coast-motor between stations.....so given that we have a lot of slack in the SSR timetables, I can easily see it working the same way for us. EDIT: it could also be a speed related thing where the train reaches the relevant maximum line speed for a given area then starts to coast. As the speed of the train drops below a certain threshold it then motors again back to the relevant maximum line speed. I’m just guessing though as like I say, I don’t know the system in enough techical detail. I've been on the ATC course and have been told the coasting speed has been set 1 km/h higher than the maximum speed, there's also an accelerometer which is suppose to get rid of jerky train movements but how this will all work in practise, we'll have to see when the system is fully up and running. Saying this, a software update in the future could probably enable a coast mode, at the moment i'm sure the priority is to get the ATC system working reliably.
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Post by firestorm on Sept 10, 2018 15:50:00 GMT
If you haven’t already, I would suggest giving the Met line twitter account a PM for the service number and timings. It’s a fairly well known issue for the leading cab not to display the external destination/calling pattern sometimes However, this is now the fourth incident I’ve read about recent days which makes wonder weather it could be a bug or some form of wider interference affecting the PIS (Pax Info Screens). Unless by some extraordinary happening we are all pondering over just one unit in which case the time continuum would also need to come in for check up. I'd say with a fair amount of certainty that this will be an issue introduced in the latest software drop. It has been causing huge issues with the CIS over the last few months and is causing a lot of grief (including the issue of no external displays). Definitely still worth reporting, however. It is like you said a known software issue and is being looked at.
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Post by firestorm on Aug 4, 2018 16:31:42 GMT
Great news! Unit 11034 has gone back into service as of today running as train number 234. Best of luck catching it on your travels.
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Post by firestorm on Aug 1, 2018 22:56:50 GMT
Find myself back at this page again haha! I am quite determined to get 11034 just to fill the gap in my book. Would anyone be able to comment if the set has entered service or not? Thank you! :-) Still awaiting to be signed off as fit for service by engineering.
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Post by firestorm on Jul 24, 2018 20:33:41 GMT
I'm guessing that there must have been some problem with the CSDE system and the driver had to override it (thus explaining the doors not opening in the first/last carriages and the delay), but the train looked to be berthed correctly from where I was standing. Is there a particularly tight stopping point at Sloane Square or is it possible that the system just malfunctioned? I'm also not sure why the driver got out of the cab The train may simply have overrun the stopping mark by a few inches? If the train has gone out of the braking arc then the rear doors will also remain closed. The cab door on the platform side must be opened for the ‘emergency open’ circuit to operate (the rear cab bulkhead open buttons must be used too). I know that the OPO antennas that give the platform interface images for the cab are bolted below the front running plates so I'd assume that CDSE antennas would be similarly located. The CSDE antenna are placed back by the second car. Corresponding aerials placed under platform edge, usually consisting of three blue or yellow thin strips. Just to add a little to that when the emergency open circuit is operated, as DStock7080 says the rear bulkhead open buttons must be used whilst the cab door on the same side must also be open (The saloon doors cannot be opened using the door open panels in the front in this situation) . The circuit has been designed this way so act of opening the doors on the correct side must be "thought about" e.g. foot on the platform, facing the platform doors and opening them. The sets of doors not opening on the first and last carriage is because of a potential overrun or not stopping fully inside a platform. Finally a slight correction, the CSDE antenna's are located on the "D" End of a DM (Driving Motor) car on both sides.
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Post by firestorm on Jul 10, 2018 3:53:56 GMT
It was from excessive speeds causing the fatal accidents, that a Speed Control After Tripping (SCAT) Timer was fitted and now standard on manually driven rolling stock. This 3 minute timer ensures the train cannot travel above 20kph which would significantly reduce the chance of a rear end collision after passing a signal at danger.
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Post by firestorm on Jun 14, 2018 15:31:30 GMT
I'm doing something similar, I've ridden all 09 Stock units over the past year, but I want them all logged on my Railmiles, I still need 11033/34, but I've not seen it at all this year Has it actually returned into traffic? It's still stopped as of today, with estimated release date for the 16/06/18. Are you able to comment on which parts its waiting for? Surprisingly all the missing/borrowed components are now back on the unit. All that remains is various post maintenance testing and depending on the outcome it might hit the release date or be pushed back. EDIT: 18/06/18 Train now awaits to be signed off as being fit for service by engineering e.g. paperwork so estimated release date is now 30/06/18
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Post by firestorm on Apr 26, 2018 20:43:25 GMT
Talking of car numbers, I've noticed that on some S8s one unit has very faded numbers, while the complementary unit's numbers are in good condition. Since the units have been together since introduction, how can one unit's numbers wear so much more badly than the other's? Graffiti and the graffiti gel they use to clean it off, strips everything off and no real urgency to replace them.
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Post by firestorm on Apr 24, 2018 2:07:24 GMT
u21096 is finally back from Derby and is at Neasden depot catching up on maintenance.
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Post by firestorm on Apr 16, 2018 15:55:20 GMT
Many thanks for the reply. I'll not worry about waiting around for it till April then! Steve.
Afternoon all........
Does anyone know if this set is back in traffic yet?
Many thanks.
The estimated release date has been pushed back to 05/05/18.Edit: As of 15/05/18 still awaiting parts, unknown release date.
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