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LMS2968's Recent Activity

  1. LMS2968 replied to the thread The 10A Allocation.

    Not really. The weights were within plates riveted over a set number of spokes and then the lead-antimony weight poured in to a pre-determined weight. The number of spokes covered did not change to suit the amount of lead added.

    Jun 13, 2026 at 10:25 AM

  2. LMS2968 replied to the thread The 10A Allocation.

    This is one of the misunderstood parts of steam loco overhaul procedures, but when an engine received a replacement boiler, the smokebox, chimney, etc. stayed with the engine, it didn't go with the boiler. For the boiler to be repaired, the...

    Jun 13, 2026 at 9:51 AM

  3. LMS2968 replied to the thread The 10A Allocation.

    I'm not sure how many Fives retained the double chimney but 4767 certainly didn't. Nor do I know how effective it was on a Black 'un; they were good steamers in single chimney form anyway.

    Jun 13, 2026 at 9:12 AM

  4. LMS2968 replied to the thread The 10A Allocation.

    The story is that the GWR men told George Ivatt that he had a good engine in the Black Five, but it was a shame it couldn't be fitted fitted with Stephenson's gear like the GWR Hall class, which, they reckoned, would improve it. Ivatt was known...

    Jun 13, 2026 at 6:54 AM

  5. LMS2968 liked 26D_M's post in the thread The 10A Allocation.

    Yes I know, I was simply pointing out John that there was no difference in max speed using 2 otherwise very similar designs, dimensionally where one has rollers and the other does not. The analogy being that black 5s are all 60mph so the addition...

    Jun 11, 2026 at 10:56 AM

  6. LMS2968 liked 26D_M's post in the thread The 10A Allocation.

    Eh? I'm not arguing with the magazine report, I'm agreeing with the technical analysis others have made vis bearing/driving wheels differential on permitted max mph. As you said David Smith says 4767 can go faster because it has rollers and...

    Jun 11, 2026 at 10:56 AM

  7. LMS2968 liked bristolian's post in the thread The 10A Allocation.

    Likewise. When the maximum operating speed for preserved steam on the main line was introduced, no mention was made of roller bearings versus plain bearings. Wheel diameter was the only factor (I'm sure) that was used, as it has a bearing (pun...

    Jun 11, 2026 at 9:30 AM

  8. LMS2968 replied to the thread The 10A Allocation.

    Thanks. Realistically the use of roller bearings was actually to reduce repair and maintenance costs. I don't recall their introduction was linked to a higher speed potential, though.

    Jun 11, 2026 at 9:11 AM

  9. LMS2968 replied to the thread The 10A Allocation.

    Yes, that thought occurred to me too. Why would one be subject to a higher speed limit than the other?

    Jun 11, 2026 at 8:12 AM
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