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Post by Deleted on Jan 11, 2006 20:49:25 GMT
It was filed like a lot of ideas. Still, keeps someone in a job  |
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Post by Deleted on Jan 21, 2006 17:13:32 GMT
I seem to remember a good few years back that when station letter codes were introduced there was a proposal to extend the scheme further and make it apply to duty numbers at depots to avoid confusion with train numbers. The idea I think was to use the first and last letters of the depot name coupled with the actual rota number at the said depot. For instance Cockfosters week 23 would become CS23. Northfields 44 = NS44 Upminster 76 = UR76 and so forth. Leave covers and RDC's would have been the depot letters with LA or RA or whatever to denote which cover was being worked. What happened to that scheme? I think that this may have a bearing on the current scheme. I *think* that the series of duty numbers is different to that of train numbers on each line, and they are seperated that way. For example, on the Picc, Arnos dutiesare 0xx and 1xx, Acton duties are 4xx and the train numbers are 2xx and 3xx. |
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Post by Deleted on Jan 21, 2006 17:16:34 GMT
Does anyone know the reason that on some lines duties are numbered (ordinary) numerically in order, ie takes in 8's and 9's as well, and on others 8's and 9's are missed out, like the programme machines? IIRC the Northern Line duties were numbered in the latter series.
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Post by Deleted on Jan 21, 2006 18:33:41 GMT
No line has 100 trains running. Even in the peak. This has provoked me to ask a question. Whats the maximum number of trains that the lines run in the peak then? |
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Post by Deleted on Jan 21, 2006 18:54:20 GMT
The District Snapshots (mon-Fri):
0600 - 45
0900 - 77
1200 - 61
1500 - 61
1800 - 77
2100 - 64
2400 - 50
So the maximum on the District in the peak is 77 trains. This obviously doesn't include Circles. It should also be noted that these figures may be slightly out at the moment because of 'operational problems'!
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Post by Deleted on Jan 21, 2006 19:30:14 GMT
Ah cheers Alan  |
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Post by citysig on Jan 21, 2006 19:59:37 GMT
If however the powers that be were to rid the system of that stupid 'octal' numbering system things could once again be simplified with all the trains on a line numbered in one series. No line has 100 trains running. Even in the peak. So the Met could be 1-99 the District 100-199 the Circle /H&C 200-299 and so forth. The duties could then be in a different series unless they revive the 'depot letter/rota week' system that was shelved. Oh no not again Bob ;D |
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Post by Deleted on Jan 21, 2006 22:54:57 GMT
No line has 100 trains running. Even in the peak. This has provoked me to ask a question. Whats the maximum number of trains that the lines run in the peak then? My guess is the Northern Line with 91 trains, though I think thats temporarily been reduced to 89 trains from this year due to lack of working rolling stock. |
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Post by Deleted on Jan 21, 2006 23:03:57 GMT
In the old days programme machines did not take any notice of duty numbers at all. The machine was only interested in the train number and train description plus time co-incidence. Then when computers started to be used for signalling control things got a bit more complicated and other data was needed to be input as well. If however the powers that be were to rid the system of that stupid 'octal' numbering system things could once again be simplified with all the trains on a line numbered in one series. No line has 100 trains running. Even in the peak. So the Met could be 1-99 the District 100-199 the Circle /H&C 200-299 and so forth. The duties could then be in a different series unless they revive the 'depot letter/rota week' system that was shelved. Isn't the octal numbering because there is concern about using decimal based numbers with the old progamme machines, and other various related systems which are well old, many of which are used today across the line? My guess is that octal numbering comes from the days when you only had three binary digits to represent each train number digit - meaning that each train number digit had a maximum limit of 7...so you could do 0 -7, then you had to jump to 10 - 17 then again jump to 20 - 27....then after 77, you'd jump to 100 then so on...for me, its very frustrating and goes against natural instinct, but probably explains why the powers at be are wary about scrapping octal numbering |
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Post by Deleted on Jan 22, 2006 2:54:57 GMT
I was thinking about the Northern Line duties - has this got anything to do with duty numbers being involved with the PTI codes (Jim states in another thread that the driver would enter train, duty and route code on the panel on a Northern Line cab)? If this has a bearing on signalling and those sort of systems maybe 8's and 9's would throw it all out.
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