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| London Underground Departure boards 20/04/2012 at 15:08 #31680 | |
ipswich
247 posts |
whilst browsing the net this afternoon i found this http://www.transporthacker.com/tubehorus/?line=N&mode=advanced&station=CTN shows you the next tube trains at any station on the underground network and the train set number list of lines at top of page stations on the right hand side Last edited: 20/04/2012 at 15:11 by ipswich Log in to reply The following users said thank you: postal, birchy74, ajax103 |
| Re: London Underground Departure boards 20/04/2012 at 21:18 #31682 | |
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Southernrover
46 posts |
It also looks like the system can pick up which track circuit the train is on at the given time.
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| Re: London Underground Departure boards 21/04/2012 at 22:29 #31699 | |
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clive
2738 posts |
It's actually quite interesting - the identifiers are related to, but not the same as, the track circuits. For example, I've just looked at Stonebridge Park. Firstly, there's a "TB" prefix on everything; platform 2 is track circuit GF, not BGF or TBGF. Presumably "TB" means "Bakerloo track circuit". Platform 1 is shown as DH1. My diagrams don't show DH as split into parts; it's just DH. There's a train shown as "BR to Watford; at Queen's Park platform 4; TBFL.FK". Now FK is the track circuit for that platform, while FL is the overlap between the starting signal and the trailing points from the Bakerloo. There's another shown as "Between Stonebridge Park and Wembley Central (TBGP.GM.GG)". GG is the overlap of signal 37 at Stonebridge Park, GM is the track circuit from there to signal 41 (guarding the diveunder under the WCML), and GP is the overlap of 41. And I've now seen one "Between Harlesden and Stonebridge Park (TBGB.GC.GD.GE)", and those four are the *whole* track between the two stations. So it's not reporting individual track circuits but small groups of them. But I still don't understand why DH and HB (at Harrow) are shown as DH1 and HB1. Log in to reply |
| Re: London Underground Departure boards 22/04/2012 at 08:32 #31702 | |
wellgroomed
109 posts |
I'd need an LUL expert to confirm this, but I understand that the feed is taken direct from the signal cabins, rather than the interlocking machine rooms. For example the Met line indication 'BS.BT.BU.BV.BZ' is exactly the indication available in Amersham Signal Cabin, and is incidentally the limit for Southbound indications too. However I believe that the IMR at Chalfont would actually show the individual track circuits as occupied. Log in to reply |
| Re: London Underground Departure boards 22/04/2012 at 20:44 #31723 | |
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metcontrol
217 posts |
In its rawest form, this data does generally refer to groups of track circuits, with certain extra prefixes that are no doubt related to the use of the data. When usually seen, the information relating to the groups of track circuits is generally shown as locations. So whilst Track AA may be shown to customers as "At X Platform" Tracks AB,AC,AD are grouped to display "between X and Y stations" and so on. Certain other tracks form the basis for time prediction, so when a train is seen at track AE, it may be 5 minutes from Station Z. Many areas also constantly assess this last part of data, so a train which is being held up will not remain as "5 minutes away" but will eventually become "Delayed" until movement is detected. The information is gathered for use in our internal "Trackernet" system. This system is fed a whole host of different bits and pieces of information, dependant on the area being shown. For example, on the Metropolitan Line the data inputs include: City area - direct information input from Met Line Signalling Control Centre Harrow - information gathered from signal cabin outputs and Interlocking Machine Rooms (IMRs) Harrow-Wembley (where not monitored by either signal cabin or control room) - information gathered from Connect Train Radio system The information feeds Trackernet, it also feeds platform describers in certain areas, and also feeds the growing number of sites using the data - and eventually it will feed our "own" site(s) full of such information. Log in to reply |