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Post by Deleted on May 20, 2011 20:58:52 GMT
I saw train 38 (75+76) in service on Tuesday
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Post by Deleted on May 21, 2011 7:27:19 GMT
When will/are all the ventelation shafts upgraded? Presumably this will make a fair difference once they're all completed.
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Post by andypurk on May 21, 2011 11:31:19 GMT
Kind of, it detects whether the line is receptive, it will regen what it can (as much power as can be put into the rails as possible), the remainder is put through the rheo. Imagine that the equation is: Maximum regen current = Sum of current draw by other trains in section. Trains can regen upto 3500 Amps (as well as take traction), so if a train is braking in a section, 2 trains are stationary in platforms (drawing say 25A each), and another train is maintaining speed between stations (drawing say 500A), the braking train will only be able to regenerate a maximum of the 550A that is being drawn by the other three trains in the section. Basic electrics generator (producing power) or motor (consuming power) unless there is digital information encoded in the electrical supply from the a a train in regenerative mode it will just be another generator which you will not be able to identify With regard to the line been receptive this means that there is a load (a train(s) taking power). I would imagine there is some balancing to try and get one train starting as another is braking to maximise efficiency and reduce demand from the National Grid. Xerces Fobe It is also possible for the regenerative braking to feed power back to the Grid, although this is much easier on the AC electrified systems than on DC. |
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Post by edwin on May 24, 2011 1:40:52 GMT
Does anyone know why the 09TS enter Oxford Circus (SB) and Victoria stations at a reduced speed all the time?
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Post by Deleted on May 24, 2011 21:35:59 GMT
Does anyone know why the 09TS enter Oxford Circus (SB) and Victoria stations at a reduced speed all the time? Because that is what they are configured to do. Should be raised a little at asset replacement, but these locations are the pinch points in terms of headway - trains running slower can run slightly better headway. Remember the contract is a performance one, and there is basically a trade off between inter station run times, and re-occupation times. |
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Post by Deleted on May 25, 2011 17:35:20 GMT
I saw t39 this eve at finsbury park SB is today it's 1st day in service?
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Post by Deleted on May 25, 2011 17:40:54 GMT
I saw t39 this eve at finsbury park SB is today it's 1st day in service? I would guess not, it looked like it had already been in service for a couple of days... |
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Post by Deleted on May 25, 2011 19:15:30 GMT
Thanks bio it's just that I didn't see any of the advertisement pics inside
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Post by Deleted on May 25, 2011 19:24:18 GMT
I caught two of the new stock on Monday, both north of EUS. Each was like an oven. Is this usual or was I just unlucky?
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Post by superteacher on May 25, 2011 19:45:24 GMT
I caught two of the new stock on Monday, both north of EUS. Each was like an oven. Is this usual or was I just unlucky? Usual. Apparently, when the trains are switched to fully regenerative braking, it will make them cooler. Can it really make that much difference - I'm not convinced it will personally. They are much hotter than the 67's ever were, so even with a but of cooling, we'll be no better off than when we started! |
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Post by Deleted on May 25, 2011 19:46:32 GMT
Thanks bio it's just that I didn't see any of the advertisement pics inside Yes, it didn't have the yellow labels on the doors yet either, but it didn't look like this was its first day - there were already some dirty hand marks on the white interiors! I think the new deliveries normally enter service at the start of the week... |
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Post by br7mt on May 25, 2011 20:34:30 GMT
I caught two of the new stock on Monday, both north of EUS. Each was like an oven. Is this usual or was I just unlucky? Usual. Apparently, when the trains are switched to fully regenerative braking, it will make them cooler. Can it really make that much difference - I'm not convinced it will personally. They are much hotter than the 67's ever were, so even with a but of cooling, we'll be no better off than when we started! It should make a big difference. At the moment 09TS cannot use regenerative braking because the 67TS cannot receive the higher voltage generated. This means the new trains are having to use rheostatic braking - burning off all that energy created using the resistor grids. That means heat (and lots of it) gets dumped into the tunnel environment. You have the added complication that the saloon ventilation takes its air from the underframe, which means on the motor cars, where the resistor grids are, you are getting hot air blown into the saloon. Regards, Dan |
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Post by superteacher on May 25, 2011 20:41:18 GMT
Usual. Apparently, when the trains are switched to fully regenerative braking, it will make them cooler. Can it really make that much difference - I'm not convinced it will personally. They are much hotter than the 67's ever were, so even with a but of cooling, we'll be no better off than when we started! It should make a big difference. At the moment 09TS cannot use regenerative braking because the 67TS cannot receive the higher voltage generated. This means the new trains are having to use rheostatic braking - burning off all that energy created using the resistor grids. That means heat (and lots of it) gets dumped into the tunnel environment. You have the added complication that the saloon ventilation takes its air from the underframe, which means on the motor cars, where the resistor grids are, you are getting hot air blown into the saloon. Regards, Dan Hope you're right! Wouldn't want the heat issue to spoil what is otherwise a very nice train. |
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Post by Deleted on May 25, 2011 21:45:04 GMT
It should make a big difference. At the moment 09TS cannot use regenerative braking because the 67TS cannot receive the higher voltage generated. This means the new trains are having to use rheostatic braking - burning off all that energy created using the resistor grids. That means heat (and lots of it) gets dumped into the tunnel environment. You have the added complication that the saloon ventilation takes its air from the underframe, which means on the motor cars, where the resistor grids are, you are getting hot air blown into the saloon. Regards, Dan Please see my earlier post and the one by Xerces Fobe. They are currently regen braking but at a lower voltage. I am sure there will be some improvement when the voltage is raised, not convinced it will be enough to make the trains feel cool though. The saloon ventilation is not from the underframe, it is from the grilles beneath the windows, however hot air convects upwards due to the tunnel walls, so hot air is drawn in. |
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Post by Deleted on May 25, 2011 22:08:41 GMT
I saw t39 this eve at finsbury park SB is today it's 1st day in service? I saw 11077 and 11078 (train 39) yesterday too  |
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Post by edwin on May 26, 2011 1:54:27 GMT
Does anyone know why the 09TS enter Oxford Circus (SB) and Victoria stations at a reduced speed all the time? Because that is what they are configured to do. Should be raised a little at asset replacement, but these locations are the pinch points in terms of headway - trains running slower can run slightly better headway. Remember the contract is a performance one, and there is basically a trade off between inter station run times, and re-occupation times. Interesting, how come this does not seem to occur on the Jubilee line for instance? |
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Post by Deleted on May 26, 2011 18:02:22 GMT
Because that is what they are configured to do. Should be raised a little at asset replacement, but these locations are the pinch points in terms of headway - trains running slower can run slightly better headway. Remember the contract is a performance one, and there is basically a trade off between inter station run times, and re-occupation times. Interesting, how come this does not seem to occur on the Jubilee line for instance? At the moment, the track circuit layout on the Vic Line is as per existing signalling, which was designed for the slower old trains. Once Asset Replacement goes through Vic and OXO, the track circuit layout will be optimised to the new trains performance. |
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Post by edwin on May 27, 2011 1:21:17 GMT
^^So the trains will run faster into Oxford Circus SB and Victoria (both ways) after the asset replacement?
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Post by 100andthirty on May 27, 2011 5:04:27 GMT
In general trains will not come into stations any faster, but the new signalling layout will allow them to get closer together, so the time interval between one train leaving and the next arriving will be shorter
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Post by malcolmffc on May 29, 2011 11:47:34 GMT
Interesting, how come this does not seem to occur on the Jubilee line for instance? Because the Jubilee line doesn't stop at Oxford Circus or Victoria? :-p |
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Post by edwin on Jun 1, 2011 0:28:02 GMT
^^Obviously I meant at the equivalently busy Jubilee line stations...
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Post by plasmid on Aug 1, 2011 22:40:22 GMT
Multiple train failures today, I know the new signalling is still being commissioned and the old being ripped out but were the train failures related to the signalling or something silly like the doors?
These trains were bought in in 2006 for testing, that's 5 years ago, surely the 09ts should be doing a little better, it seems to be a near daily occurrence now.
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Post by jardine01 on Aug 2, 2011 6:40:20 GMT
Its the same here i cant understand why they keep on having silly faults now the most common problem is the doors. However when you bring a new train in they bring lots of faults. Look at the 1995 stock they kept on breaking down for years only in the past few years reliablity seems to have inproved.
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Post by plasmid on Aug 2, 2011 16:33:13 GMT
Reliability was improved on the 95ts after a review of the most common faults. The doors were consequently refreshed on all of the 95ts due to on-going issues with them.
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Post by jardine01 on Aug 2, 2011 17:42:24 GMT
What are the most common faults on the 2009 stock apart from sensitive edge door problems?
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