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Post by snoggle on Jul 26, 2016 19:02:45 GMT
Looks like TfL are having to go back and seek revised authority in respect of the 5 car works. Unfortunately the paper has scant detail (quelle surprise!) but given its tone it looks like the infrastructure works have proved more costly than expected. content.tfl.gov.uk/fpc-160727-item06-locip-p1-final.pdf
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Post by dazz285 on Jul 26, 2016 20:41:03 GMT
perhaps when they extended the platforms for 4 car they really should have made it 5... Very poor short-sightedness.
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Post by stapler on Jul 27, 2016 7:06:29 GMT
Or six-car, judging by the level of crowding on Camden Rd-Stratford.
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Post by dazz285 on Jul 27, 2016 8:12:05 GMT
apparently class 378's can't be extended to 6 car anyway. The only option now is to increase the frequency. DC will be going to a 15 min service once all the class 710's have arrived then the class 378 will head upstairs to the NLL/WLL to increase their services.
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Post by stapler on Jul 27, 2016 8:14:06 GMT
apparently class 378's can't be extended to 6 car anyway. The only option now is to increase the frequency. DC will be going to a 15 min service once all the class 710's have arrived then the class 378 will head upstairs to the NLL/WLL to increase their services. Think I've heard that before, but why not?
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Chris M
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Post by Chris M on Jul 27, 2016 9:44:29 GMT
apparently class 378's can't be extended to 6 car anyway. The only option now is to increase the frequency. DC will be going to a 15 min service once all the class 710's have arrived then the class 378 will head upstairs to the NLL/WLL to increase their services. Think I've heard that before, but why not? The train software apparently cannot cope with more than 5 cars.
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Post by stapler on Jul 27, 2016 10:30:47 GMT
Train software? Surely software can be upgraded? (and frequently is, as systems change...)
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Chris M
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Post by Chris M on Jul 27, 2016 11:36:47 GMT
embedded systems are rather different to PC software as the whole design philosophy is around reliability rather than flexibility. A train system is designed to work only with the very specific hardware it is installed on, and the job each system does will do on day 10,000 exactly what they did on day 1. No new programs will have been installed, it doesn't need to do the equivalent of both word processing and spreadsheets for example. This way the number of bugs in the system will be far fewer and updates almost unneeded, etc.
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Post by will on Jul 27, 2016 13:31:25 GMT
I k ow this may highlight my train systems ignorance but wouldn't it be possible to wire to carriages together so that 2 carriages could be seen by the trains computer as 1 carriage?
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Post by peterc on Jul 27, 2016 14:37:51 GMT
It should be possible in theory but the train system only recognises a certain amount of kit in each carriage so your "virtual carriage" could only have two pairs of doors instead of four, etc etc
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Post by jukes on Jul 27, 2016 15:50:43 GMT
It is quite correct that the 378s cannot be extended to 6-car for all the reasons given above. The DC line frequency will remain at 3 tph with the arrival of the six new 710s which is the same number of units as 378s currently allocated - they will be cascaded to the NLL and ELL. In order to increase the DC frequency to 4 tph (i.e., every 15 minutes) you would need 8 units - and there is an option for 2 extra units (not yet exercised) in the contract for the 710s. Similarly to increase the GOB from 4 tph to 5 tph, you would need 2 extra 710s and here again there is an option in the contract (also not yet exercised). There are also contractual options for the additional units required for the Barking Riverside extension and possibly for Stratford-Angel Road (STAR) services.
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Post by norbitonflyer on Jul 27, 2016 19:04:27 GMT
The DC line frequency will remain Did a double take at that, as on DC the (electrical) line frequency is, by definition, zero!
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