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  1. Allegheny
    مشاركة

    Coal fired Power Stations

    On the subject of safety, a few years ago I attended a health & safety presentation given by the MD of the company I was working for. He mentioned...
    المشاركة بواسطة: Allegheny, ‏28 سبتمبر 2024 في منتدى: Everything Else Heritage
  3. Allegheny
    الموضوع

    Coal fired Power Stations

    I've been reading that the last UK coal fired power station is due to close. I'm wondering if anything is being done to preserve some of the...
    الموضوع بواسطة: Allegheny, ‏19 سبتمبر 2024, 29 ردود, في منتدى: Everything Else Heritage
  4. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    You could have 3 or 4 wagons, one in use and the rest on charge and keep swapping them over.
    المشاركة بواسطة: Allegheny, ‏27 جوان 2024 في منتدى: Diesel & Electric Traction
  5. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    Likewise, in most photographs I've seen, the DC overhead conductors have been quite chunky.
    المشاركة بواسطة: Allegheny, ‏24 جوان 2024 في منتدى: Diesel & Electric Traction
  6. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    Mulling over this question a bit further, if you get it wrong there's a risk of a lot of hot wire falling on a platform somewhere. I don't really...
    المشاركة بواسطة: Allegheny, ‏24 جوان 2024 في منتدى: Diesel & Electric Traction
  7. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    Thanks for that, I think it comes down to how much starting current a heritage EMU takes, and from the discussion above it could be quite high, if...
    المشاركة بواسطة: Allegheny, ‏24 جوان 2024 في منتدى: Diesel & Electric Traction
  8. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    Thanks for the clarification, though could you please expand on "disproportionate impact"? From a technical point of view, I go to work every day...
    المشاركة بواسطة: Allegheny, ‏24 جوان 2024 في منتدى: Diesel & Electric Traction
  9. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    That's logical, the power is the product of voltage and current so, for the same power, the lower voltage locomotive requires more current and...
    المشاركة بواسطة: Allegheny, ‏24 جوان 2024 في منتدى: Diesel & Electric Traction
  10. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    It may well be the case. Any train actually uses more power at high speed than low speed, and it is just the inefficiency of the old-school...
    المشاركة بواسطة: Allegheny, ‏24 جوان 2024 في منتدى: Diesel & Electric Traction
  11. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    Yes. Assuming we are talking about old-school DC traction motors with resistance starters, torque (tractive effort) is related to the current and...
    المشاركة بواسطة: Allegheny, ‏24 جوان 2024 في منتدى: Diesel & Electric Traction
  12. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    I don't see this, the power requirement goes up as the cube of speed. At a heritage line speed of 25mph the train would take 7% of the power...
    المشاركة بواسطة: Allegheny, ‏22 جوان 2024 في منتدى: Diesel & Electric Traction
  13. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    Extra Low Voltage is defined as <50V AC or <120V DC. I'm wondering a) whether 3rd rail operating at 120V DC would be considered safe (given...
    المشاركة بواسطة: Allegheny, ‏15 جوان 2024 في منتدى: Diesel & Electric Traction
  14. Allegheny
    مشاركة

    Steam speed records including City of Truro and Mallard

    This is probably a red-herring, but there can be an effect when dealing with sampled data known as "aliasing". Among other things it occasionally...
    المشاركة بواسطة: Allegheny, ‏20 ديسمبر 2023 في منتدى: Steam Traction
  15. Allegheny
    مشاركة

    Steam speed records including City of Truro and Mallard

    Fix It Again Tomorrow
    المشاركة بواسطة: Allegheny, ‏14 ديسمبر 2023 في منتدى: Steam Traction
  16. Allegheny
    مشاركة

    Steam speed records including City of Truro and Mallard

    I would challenge anyone to come up with an alternative practical design with effectively eight chimneys!
    المشاركة بواسطة: Allegheny, ‏14 ديسمبر 2023 في منتدى: Steam Traction
  17. Allegheny
    مشاركة

    Steam speed records including City of Truro and Mallard

    If this is the argument about a multiple chimney being better than a single chimney (where required) I agree entirely with you. I've also...
    المشاركة بواسطة: Allegheny, ‏14 ديسمبر 2023 في منتدى: Steam Traction
  18. Allegheny
    مشاركة

    Steam speed records including City of Truro and Mallard

    I've always been curious about why a Kylchap works better than some of the alternatives. Would it be fair to say that you have a large mass of...
    المشاركة بواسطة: Allegheny, ‏13 ديسمبر 2023 في منتدى: Steam Traction
  19. Allegheny
    مشاركة

    92134

    I'm just wondering if there would be anything to gained by testing an axle counter with a 9F on a heritage railway, just to see how consistently...
    المشاركة بواسطة: Allegheny, ‏5 ديسمبر 2023 في منتدى: Steam Traction
  20. Allegheny
    مشاركة

    Chapelon and related Matters

    I'm enjoying reading this thread. Would you consider Porta and Wardale to be more "practical" engineers (whatever that means) than Chapelon?
    المشاركة بواسطة: Allegheny, ‏3 نوفمبر 2023 في منتدى: Steam Traction
  21. Allegheny
    مشاركة

    Overhead DC electrification - a potential solution to the conundrum of EMUs?

    Could you run these on the Isle of Wight electric railway? - apart from through the tunnel.
    المشاركة بواسطة: Allegheny, ‏22 سبتمبر 2023 في منتدى: Diesel & Electric Traction
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