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Post by Busboy105 on Sept 4, 2020 15:53:46 GMT
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Post by LJ17THF on Sept 4, 2020 16:48:01 GMT
I'm not sure about the "214" above the word "Hammersmith", but it might be a running number? The "21330" under "Circle Line" is a fleet number for the train. |
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Post by Busboy105 on Sept 4, 2020 17:37:15 GMT
I'm not sure about the "214" above the word "Hammersmith", but it might be a running number? The "21330" under "Circle Line" is a fleet number for the train. Ok. Thanks |
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Post by Catford94 on Sept 4, 2020 19:36:47 GMT
Yes, the number 214 on that picture is the 'train number' in Underground language, the equivalent of a London bus 'running number' in the schedule (i.e. train 214 will start at depot A at this time, work the train at this time from A to B, then train at that time from B to C and so on until it ends up at depot D at a particular time. Normally that unit would stay on train working 214 all day, but would probably be on a different working the next day (especially if it ends up at a different depot / siding, which happens on some lines for maintenance.) Such things used to be metal plates, as in www.flickr.com/photos/23700069@N03/8044549386 - train number 047 on the district line. The sequences may be based on what depot / siding the train starts its day from (e.g. 001 to 015 are from this depot, 016 to 030 from that depot) or may be grouped by what workings the train will be on - I can't remember the detail (and it may have changed since) but on the northern line, it used to be that one sequence was trains that did Bank branch, another sequence did Charing Cross (think 2 digit numbers were one and 3 digit numbers the other) |
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Post by Green Kitten on Sept 4, 2020 19:57:59 GMT
The number on train 'e.g' 214 is the running number of the train. Each line has its trains numbered in a certain number range and order. Some lines have their trains numbered by sequence (just like buses usually are). Some lines have their trains numbered by which depot they started from. 214 for instance here is a Circle Line train (which are numbered in sequence - range used is 200-217). The WTTs show how the trains are numbered for each line. The Circle, District, Hammersmith & City, Metropolitan and Piccadilly are part of the Sub-Surface area - so each use one section of the 1-477 range. You may note that (with very few exceptions) no Train Number uses the digit 8 or 9. |
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Post by Dstock7080 on Sept 4, 2020 20:01:50 GMT
Currently on Northern Line (TTN224/20);
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Post by Catford94 on Sept 4, 2020 20:43:32 GMT
You may note that (with very few exceptions) no Train Number uses the digit 8 or 9.
I'd never noticed that - presume there's some technical reason?
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Post by paulsw2 on Sept 4, 2020 22:24:17 GMT
You may note that (with very few exceptions) no Train Number uses the digit 8 or 9. I'd never noticed that - presume there's some technical reason?
It is down to the original program machines and other parts of the signalling systems there are NO underground train numbers containing the number 8 or 9 |
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Post by Dstock7080 on Sept 5, 2020 5:50:58 GMT
It is down to the original program machines and other parts of the signalling systems there are NO underground train numbers containing the number 8 or 9 Not quite correct now, as since 6 July 2020 Central TTN223/20 is using train numbers with 8 and 9 on Saturdays. |
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