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Post by ruislip on Jul 14, 2009 20:03:16 GMT
why would that appear on the departure boards for Upminster? Doesn't someone know it has been 45 years since the District served Hounslow?
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Deleted
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Post by Deleted on Jul 14, 2009 20:36:00 GMT
Trains are given something called descriptions which does as it says, it identfies a train during the course of it's journey and in a place like Upminster this will be inputted manunaly by the signaller in the cabin. Description are a combination of 5 letters (a-e) so let's just say purely as an example a,b,d might be ealing broadway and b,e might be wimbledon. Now it could be the signaller might have put in a hounslow non-stop in error or a code which is the same might have been used and got picked up by the system
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mrfs42
71E25683904T 172E6538094T
Big Hair Day
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Post by mrfs42 on Jul 14, 2009 20:59:16 GMT
According to my notes, the Hounslow non-stop code came in with TC17/67: Programme Machine Working at Earls Court High Street (Kensington), Gloucester Road and South Kensington.
I *think* the appropriate code was CD, which was Hounslow, then Heathrow non-stop; it is now Northfields Siding. My notes are a bit labyrinthine on this particular code.
Curious.
EDIT:
*penny drops*
BCD is the code to Upminster - the 'B' has been glitched out.
Hang on..... You're seeing the system 'thinking' that the train departing from Upminster is off to Hounslow. *thinks*
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Post by happybunny on Jul 15, 2009 0:12:21 GMT
ruislip, I don't understand. Did you actually see this description on a dot-matrix screen? Or was it on trackernet or something?
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Post by ruislip on Jul 15, 2009 3:14:05 GMT
ruislip, I don't understand. Did you actually see this description on a dot-matrix screen? Or was it on trackernet or something? It was at the TFL's website--their departure boards for Upminster. |
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Deleted
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Post by Deleted on Jul 15, 2009 6:42:39 GMT
As an educated guess an engineers train, track recording train etc.
Or a time portal sprung up over Upminster suddenly ;D
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Post by happybunny on Jul 15, 2009 9:27:35 GMT
Ok thanks. It would have been interesting to see what the dot matrix screen said at Plaistow, assuming the Barking man didn't change the TD. I find wrong TD's are always corrected according the the trains blind, at Whitechapel WB. TDs are often lost as the train arrives there so the signalman will always check and enter the correct TD.. but nothing usually happens to it until there.
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Post by railtechnician on Jul 15, 2009 11:01:20 GMT
In general terms wrong TDs can appear for all sorts of reasons, as mentioned manual setting is one possibility. Another is programme machines becoming out of step for one reason or another, then there are TD equipment faults and cable faults to consider and of course there is always the possibility that a description has been deliberately punched up at a lineman's request for test purposes.
Apart from programme machines getting out of step perhaps the most common reason for a wrong description is a cable or equipment fault causing one 'bit' of the 5 bit code to disappear just as mrfs42 has indicated.
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