• Our booking engine at tickets.railforums.co.uk (powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!

Recent content by D7666

  1. D

    Why not control future-build EMUs from the rear cab?

    FWIW the tender ITT went out for what is now Class 700 did specify ability to drive from rear cab using cctv when necessary. this feature was dropped from the actual tender and 700s can not do it. Like it or not, it IS a serious idea
  2. D

    2024 Tube Stock (Siemens Inspiro)

    A And per further upthread, it can not be that per se as a 73 car runs in the TRV train, car 666 is 73 stock. Yes 666 has been modified, but it physically fits, it has not had anything chopped out of it length wise or overhang wise, therefore only kinematic envelope has been altered TO MAKE IT...
  3. D

    2024 Tube Stock (Siemens Inspiro)

    Sorry but I do not understand. I am trying to understand this issue but so far none of the info available adds up; indeed some of it adds up to not making any sens at all. You now appear to be saying 1973 could not operate on the Bakerloo as the train whole length is too great to fit some...
  4. D

    "TOPS" loco class classification - when did this actually start?

    1979 ? Only EIGHT years after 1971 then. Memory can lapse in 8 years. 2 memories. Two of us recall this. Our dates align. Late 1971 / early 1972 are ingrained in my memory as the D800 / D7000 rundowns ended / started, and for many other reasons. It has to be based on memory. We did not have...
  5. D

    "TOPS" loco class classification - when did this actually start?

    In the 52 years from 1972 to 2024 I never ever had cause to question it was anything else. Most likely a trial version if not 'live' until mid 1973; live can have all sorts of different meanings, the engineers and developers could ave been using real data for Mendip stone long before handover...
  6. D

    "TOPS" loco class classification - when did this actually start?

    Well put. By not tripping over the threshold of expansion demanding a doubling, you save code => save cost. BR was very good at that sort of thing.
  7. D

    "TOPS" loco class classification - when did this actually start?

    TOPS software could always do 2+3 anything. TOPS hardware at first implementation could not. Back in 1970 hardware cost significant. In binary, for every number string that is one bit longer than the previous one, your memory needs double. Work that back through every line of code it will add up.
  8. D

    "TOPS" loco class classification - when did this actually start?

    Well as Fortran was the lingo for the computer part of my Warwick engineering degree, that does align with the engineering lecturer ex Derby. So all what I type is not rhubarb. 1707929232 Those early restrictions are really due to the cost of hardware. For example having a field that is 000...
  9. D

    "TOPS" loco class classification - when did this actually start?

    My first year at secondary school level in Salisbury was also 1970-1971. I agree that Westbury had some form of computer wagon control working by early 1972 which means almost certain to have been a 1971 install. I well remember the early 1972 re-launch of the much increased Mendips stone...
  10. D

    2024 Tube Stock (Siemens Inspiro)

    Yes, But it still fits. It is still a 73TS car. Altering dynamic profile is relatively insignificant. They have not chopped out several metre of body length - which is what the comment to which I was responding had suggested needed for 2024TS.
  11. D

    Class 503 disposal

    Class 306 new 1949 Class 506 new 1954 As built, the latter is an update of the former. Adapting a 306 from DC to AC does not negate that a 306 predates 506 by 5 years.
  12. D

    Class 503 disposal

    Thanks and QED
  13. D

    Class 503 disposal

    The 306 is still about (and at Shildon) isn't it ? The 506 is really little more than a 306 update and partly duplicates a 306.
  14. D

    2024 Tube Stock (Siemens Inspiro)

    But I can't see any Picc trains working on Bakerloo even if reformed appropriately. One of the things that would need to be done is depots then; already Northfields and Cockfosters need quite a bit of work for 2024; Stonebridge Park requires even bigger work to accomodate proposed Bakerloo...
  15. D

    2024 Tube Stock (Siemens Inspiro)

    The same type of stock is intended for the Bakerloo long term - ; not looked it up but IIRC the Bakerloo is provisionally up to 78 9car sets. AFAIK 73 cars do /generally/ fit on the Bakerloo - the track recording unit middle car 666 is 73 stock - or is someone going to say that train never goes...

Top