The 387 Is ******* Quick Under Ac Overhead Power.

Discussion in 'Off Topic' started by james64, Oct 14, 2021.

  1. james64

    james64 Well-Known Member

    Joined:
    Mar 1, 2020
    Messages:
    389
    Likes Received:
    791
    Having been on these trains IRL I knew they performed much better on AC power but actually driving them really put it into perspective.

    I had a run in off the rails mode from Paddington to Slough and the better acceleration was immediately noticeable. It wasn't long before I had reached it's top speed of 110mph, and leaving the power at notch 4 it maxed out at 122 by around Southall! I then brought it back down to coast at 110 to maintain a vague sense of realism.

    Coming into Slough the better braking was noticeable too, it feels much more responsive.
     
    • Helpful Helpful x 2
  2. xi haoyu china

    xi haoyu china Active Member

    Joined:
    Sep 14, 2021
    Messages:
    234
    Likes Received:
    104
    [removed by Protagonist - please do not use multiple copies of the same quote]
     
    Last edited by a moderator: Oct 18, 2021
  3. JealousSheep768

    JealousSheep768 Well-Known Member

    Joined:
    Aug 6, 2021
    Messages:
    259
    Likes Received:
    353
    [removed by Protagonist - off topic]
     
    Last edited by a moderator: Oct 18, 2021
    • Like Like x 3
    • Helpful Helpful x 2
  4. Southern Driver

    Southern Driver Active Member

    Joined:
    Aug 20, 2020
    Messages:
    50
    Likes Received:
    119
    Electrostars are quicker under the wires because on DC there is a thing called Current Limit Index which means they can’t work to their full potential.
     
    • Helpful Helpful x 2
    • Like Like x 1
  5. james64

    james64 Well-Known Member

    Joined:
    Mar 1, 2020
    Messages:
    389
    Likes Received:
    791
    Ah I see. I has just assumed it was simply because a third rail couldn't supply as much power, but I guess there's more to it than that.
     
    • Helpful Helpful x 1
  6. fabdiva

    fabdiva Well-Known Member

    Joined:
    Jan 13, 2019
    Messages:
    577
    Likes Received:
    555
    Power is Voltage x Current - so to get the same power from a lower voltage you need higher currents - which is very undesirable and may overheat the rail and pickup shoes.

    This is why many high power DC overhead locos will start with both pans up and then drop one as the current drops. 374s also run with 4 pans up on 1500V DC to avoid overheating the pans
     
    • Helpful Helpful x 1
  7. xi haoyu china

    xi haoyu china Active Member

    Joined:
    Sep 14, 2021
    Messages:
    234
    Likes Received:
    104
    [removed by Protagonist - off topic]
     
    Last edited by a moderator: Oct 18, 2021
  8. driverwoods#1787

    driverwoods#1787 Well-Known Member

    Joined:
    Feb 21, 2021
    Messages:
    2,731
    Likes Received:
    1,634
    You mean attempting a normal GWR Commuter service London to Reading final destination is Newbury/Bedwyn
     
  9. fabdiva

    fabdiva Well-Known Member

    Joined:
    Jan 13, 2019
    Messages:
    577
    Likes Received:
    555
    387s don't go to Bedwyn - those are 5 car 80x for terminators - or IIRC some of the Exeter - London stoppers call there.
     
  10. james64

    james64 Well-Known Member

    Joined:
    Mar 1, 2020
    Messages:
    389
    Likes Received:
    791
    I wasn't trying to recreate any specific service. Just wanted a quick run on a route I know 387s traverse in real life.
     
    • Like Like x 1
  11. driverwoods#1787

    driverwoods#1787 Well-Known Member

    Joined:
    Feb 21, 2021
    Messages:
    2,731
    Likes Received:
    1,634
    ok then since I'm under the impression that you're recreating a Paddington to Newbury service
     
  12. xi haoyu china

    xi haoyu china Active Member

    Joined:
    Sep 14, 2021
    Messages:
    234
    Likes Received:
    104
    [removed by Protagonist - off topic]
     
    Last edited by a moderator: Oct 18, 2021
  13. JealousSheep768

    JealousSheep768 Well-Known Member

    Joined:
    Aug 6, 2021
    Messages:
    259
    Likes Received:
    353
    [removed by Protagonist - off topic]
     
    Last edited by a moderator: Oct 18, 2021
    • Like Like x 1
    • Helpful Helpful x 1
  14. xi haoyu china

    xi haoyu china Active Member

    Joined:
    Sep 14, 2021
    Messages:
    234
    Likes Received:
    104
    [removed by Protagonist - off topic]
     
    Last edited by a moderator: Oct 18, 2021
  15. MYG92

    MYG92 Well-Known Member

    Joined:
    Mar 3, 2019
    Messages:
    1,018
    Likes Received:
    1,806
    [removed by Protagonist - off topic]
     
    Last edited by a moderator: Oct 18, 2021
    • Like Like x 2
  16. formulabee#1362

    formulabee#1362 Well-Known Member

    Joined:
    Dec 21, 2020
    Messages:
    1,248
    Likes Received:
    1,516
    [removed by Protagonist - off topic]
     
    Last edited by a moderator: Oct 18, 2021
    • Like Like x 5
    • Helpful Helpful x 1
  17. trainsimgaming1001

    trainsimgaming1001 Well-Known Member

    Joined:
    May 4, 2021
    Messages:
    319
    Likes Received:
    341
    [removed by Protagonist - off topic]
     
    Last edited by a moderator: Oct 18, 2021
  18. aglomarsale

    aglomarsale Well-Known Member

    Joined:
    May 24, 2021
    Messages:
    238
    Likes Received:
    265
    Its weird to see what would be a commuter train go so fast.
     
    • Like Like x 1
  19. MYG92

    MYG92 Well-Known Member

    Joined:
    Mar 3, 2019
    Messages:
    1,018
    Likes Received:
    1,806
    Not that weird I take some commuter trains that reach speed like 140 kph or 160 kph
     
  20. aglomarsale

    aglomarsale Well-Known Member

    Joined:
    May 24, 2021
    Messages:
    238
    Likes Received:
    265
    125mph
    200kmh
     

Share This Page