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MarkinDurham's Recent Activity

  1. MarkinDurham liked Chris86's post in the thread North Yorkshire Moors Railway General Discussion.

    We (as a family) have certainly not bothered travelling on a day at the NYMR when steam has been substituted by a diesel due to a lack of Steam availability as opposed to weather related restrictions.

    Jul 10, 2026 at 11:16 AM

  2. MarkinDurham liked The Gricing Owl's post in the thread RTC: End of Southern Steam - 9/07/26.

    I didn't go out to time steam on the 9th July 1967 as we thought it was all over, and it is now, was what we said after the whistle went at the end of 9 July 1967. With help very gratefully received from Ian Simpson and a good number of other...

    upload_2026-7-9_12-10-19.png upload_2026-7-9_12-17-31.png Jul 9, 2026 at 3:33 PM

  3. MarkinDurham replied to the thread North Yorkshire Moors Railway General Discussion.

    RFAs were still running on what the MOD called "FFO" (Furnace Fuel Oil) in the 1980s - we bunkered several of them, including motorships, in the Falklands up until 1986 from the ship I was serving in, m.v."Scottish Eagle", and probably for...

    Jul 9, 2026 at 2:50 PM

  4. MarkinDurham liked brennan's post in the thread North Yorkshire Moors Railway General Discussion.

    Basic thermodynamics. Whilst heat transfer in the boiler is reasonably efficient the open steam cycle used in a locomotive is horribly inefficient. A diesel engine has an efficiency in the order of 30% to 40% then there are transmission losses....

    Jul 9, 2026 at 10:24 AM

  5. MarkinDurham replied to the thread GWR four-cylinder arrangement?.

    Well, the Midland compounds seemed to do OK, but yes, the UK loading gauge was/is pretty restrictive. I do wonder how Fowler's proposed compound Pacific would have turned out - hopefully with decent axleboxes, but that's another discussion... Mark

    Jul 5, 2026 at 1:31 PM

  6. MarkinDurham liked 5944's post in the thread LE movements, ECS and test runs 2026.

    "Having done some googling, the 27mph output seems to be the result of a redundant 'fix' to a problem with VSTP source data that was resolved last year. There was a bug with the NR data for VSTPs that multiplied their projected speeds by 2.24,...

    Jul 5, 2026 at 12:37 PM

  7. MarkinDurham replied to the thread LE movements, ECS and test runs 2026.

    Thanks for that - it just seemed strange. Mark

    Jul 5, 2026 at 11:45 AM

  8. MarkinDurham replied to the thread LE movements, ECS and test runs 2026.

    27mph max? Really? Mark

    Jul 5, 2026 at 11:10 AM

  9. MarkinDurham replied to the thread RTC: Tynesider - 4/7/26.

    In fairness to the operators, from what I could see on Traksy, the debacle at York was a consequence of a procession of out of path/delayed service trains coming from Colton Junction on the down Leeds, along with further late running departures...

    Jul 5, 2026 at 7:42 AM
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