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Post by sawb on Dec 20, 2014 20:07:22 GMT
On westbound DMIs, when showing Uxbridge trains, some show simply "Uxbridge" (Acton Town as an example) whereas others (Holborn and Covent Garden as examples) show "Hillingdon / Uxbridge". Does anyone know why this might be?
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Post by superteacher on Dec 20, 2014 20:34:55 GMT
Historically, the signalling couldn't distinguish between the two destinations. There used to be Picc trains stabling in Uxbridge sidings after the evening peak; these would detrain at Hillingdon and run directly into the sidings. It's been a few years since these were abolished, so some of the DMI's have been amended to interpret the Hillingdon / Uxbridge code to show Uxbridge only. It seems that they haven't all been updated though.
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Post by Deleted on Dec 20, 2014 20:37:18 GMT
It's possible for westbound trains to terminate at Hillingdon and run straight into Uxbridge sidings, which are alongside the station. This is a much easier, more direct route than shunting your way into them from Uxbridge station, but obviously has the significant disadvantage that the important station of Uxbridge is not served. Presumably trains could also easily be reversed via Uxbridge sidings and re-enter service at Hillingdon in the event of certain failures at Uxbridge or, possibly, if it is getting clogged up because of delays. Back in the day a reasonable number of peak hours Piccadilly line trains were indeed booked to terminate at Hillingdon and run into Uxbridge sidings. However, the describer system could not distinguish between a train for Uxbridge sidings (terminating at Hillingdon) and a train for Uxbridge station. I think I read somewhere that originally plain old 'Uxbridge' was used for all trains, whether they were terminating at Hillingdon or Uxbridge and then they decided to change it to 'Hillingdon/Uxbridge' to cover both bases. Unfortunately, if memory serves, they couldn't (or maybe simply haven't) change it back when the regular Hillingdon terminators disappeared from the timetable. The question of why this only affects some stations and not others, though, is something I'll have to leave to somebody else. Edit: Sorry, posted before I realised superteacher had replied but I think between us we've covered all the bases  |
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castlebar
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Post by castlebar on Dec 20, 2014 20:55:24 GMT
I remember being on Covent Garden w/b platform about 1972 and seeing a Picc service train roll in with "Hillingdon" displayed on the destination blind
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Post by Deleted on Dec 20, 2014 21:15:16 GMT
The signs which show hillingdon / uxbridge work off the original equipment. The newer signs which also show a clock at the bottom work off the same system as Trackernet
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Post by Deleted on Dec 20, 2014 21:47:09 GMT
The signs which show hillingdon / uxbridge work off the original equipment. The newer signs which also show a clock at the bottom work off the same system as Trackernet Can the new ones show Hillingdon if required? |
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Post by Deleted on Dec 20, 2014 22:00:27 GMT
I don't remember seeing a Hillingdon description available think its just a Uxbridge with the signal op at Rayners Lane knowing by the train number is it goes straight to the sidings
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Post by Deleted on Dec 20, 2014 22:10:49 GMT
I see, thanks  |
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castlebar
Planners use hindsight, not foresight
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Post by castlebar on Dec 21, 2014 11:21:09 GMT
@ DistrictSOM
What do you actually mean with this...."I don't remember seeing a Hillingdon description available"
It was available on the roller blinds fitted to the stock.
It wasn't available on some/all of the platform indicators. But there's another question. Was it available on ANY platform indicators or did they just use "Uxbridge". This is a question that tubeprune would me able to answer from his extensive memory bank.
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Post by superteacher on Dec 21, 2014 11:40:18 GMT
@ DistrictSOM What do you actually mean with this...."I don't remember seeing a Hillingdon description available" It was available on the roller blinds fitted to the stock. It wasn't available on some/all of the platform indicators. But there's another question. Was it available on ANY platform indicators or did they just use "Uxbridge". This is a question that tubeprune would me able to answer from his extensive memory bank. All of the first generation DMI's used Hillingdon / Uxbridge. Am trying to remember what the old light box indicators used to say. The one at Acton Town used to have "Uxbridge" on its own, but I never saw a Hillingdon train there, so can't recall whether "Hillingdon" was an option on the platform indicator. |
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Post by Alight on Dec 21, 2014 13:25:55 GMT
I think all the responses so far have pretty much covered it, but there are several older threads if anyone's interested: 20062009 (most comprehensive) 2010The signs which show hillingdon / uxbridge work off the original equipment. The newer signs which also show a clock at the bottom work off the same system as Trackernet I'm pretty certain I've seen the 'newer signs' (with the clock) displaying Hillingdon/Uxbridge, not just the older type - does this mean that some of the newer signs are linked in with the original equipment? In terms of how easy it is to change what is displayed on the older signs, don't forget they used to have an aeroplane symbol for Heathrow, which has since been removed!  |
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Post by Deleted on Dec 22, 2014 15:06:12 GMT
The newer signs can be direct replacements for existing DMI's but sites were DMI's have never been fitted before do work off the different system. Some signs on certain lines show no info what so ever as they are waiting for the eventual upgrade to take place.
When I said I didn't think a Hillingdon description was available I was referring to the signalling train description equipment not what the actual trains could show.
The picture shows the original Heathrow description since terminal 5 opened the designers had to pinch the SPECIAL code for terminal 5 as they had run out of available codes.
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Post by Alight on Dec 23, 2014 13:26:35 GMT
Thanks for the clarification. I suppose a good example of what you've described is at Green Park; they have newer screens that work off the old system, which is why they still display "Hillington / Uxbridge" The next step would be for LUL to do away with the misguided abbreviation of 'MINS' in favour of 'min', as per the London Overground and bus networks. Obviously a minor point in the grand scheme of things though...  |
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