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Post by jamesb on Sept 29, 2013 13:10:21 GMT
My understanding is that the Victoria line can now run 33 trains per hour, and that the new signalling system installed was a fixed block system? Is that right?
Yet the Jubilee line, which was competed around the same time / before the Victoria line upgrade, is a moving block system (as will be the Northern line). The Jubilee now runs 30 trains per hour (less then the Victoria)
Why was one system chosen for the Victoria yet a different one for the Northern / Jubilee?
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Post by domh245 on Sept 29, 2013 13:40:10 GMT
The Victoria line system is an Invensys (formerly Westinghouse) DTG-R (Distance to go - Radio) system, whilst the Jubilee is a Seltrac S40 system, as used on the DLR. The main reason behind the different installations was to do with the PPP fiasco. Metronet went for the Invensys system (which was also going to be used on their other area - the SSR) whilst Tube Lines went for the Seltrac system, now used on the Jubilee and the Northern line (one of their other charges). Regarding Trains per Hour, the Victoria has more primarily because it has a faster linespeed with trains of a greater acceleration than the Jubilee.
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Post by jamesb on Sept 29, 2013 18:11:29 GMT
so which is:
a) 'better'?
b) more technologically advanced?
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Post by domh245 on Sept 29, 2013 18:27:49 GMT
Better: Personal opinion really, although LU management have said "they don't want any more cables on the tracks" which puts the Seltrac system at a disadvantage. I would say that the Invensys system is better as it is noticeably less jerky than the other system. More technologically advanced: I would probably say the Invensys system wins once again. It uses an onboard memory of the track, rather than simply receiving instructions from the track side. However the Seltrac system uses inductive loop technology, rather than transmitting through the running rails. But then again, I am not a signal engineer, so don't take my word as gospel. This article could be very enlightening. |
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