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

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

  1. james64

    james64 Well-Known Member

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    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.
     
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  2. xi haoyu china

    xi haoyu china Active Member

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    [removed by Protagonist - please do not use multiple copies of the same quote]
     
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  3. JealousSheep768

    JealousSheep768 Well-Known Member

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  4. Southern Driver

    Southern Driver Active Member

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    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.
     
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  5. james64

    james64 Well-Known Member

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    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.
     
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  6. fabdiva

    fabdiva Well-Known Member

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    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
     
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  7. xi haoyu china

    xi haoyu china Active Member

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  8. driverwoods#1787

    driverwoods#1787 Well-Known Member

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    You mean attempting a normal GWR Commuter service London to Reading final destination is Newbury/Bedwyn
     
  9. fabdiva

    fabdiva Well-Known Member

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    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

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    I wasn't trying to recreate any specific service. Just wanted a quick run on a route I know 387s traverse in real life.
     
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  11. driverwoods#1787

    driverwoods#1787 Well-Known Member

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    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

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  13. JealousSheep768

    JealousSheep768 Well-Known Member

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    [removed by Protagonist - off topic]
     
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  14. xi haoyu china

    xi haoyu china Active Member

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  15. MYG92

    MYG92 Well-Known Member

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    [removed by Protagonist - off topic]
     
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  16. formulabee#1362

    formulabee#1362 Well-Known Member

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    [removed by Protagonist - off topic]
     
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  17. trainsimgaming1001

    trainsimgaming1001 Well-Known Member

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  18. aglomarsale

    aglomarsale Well-Known Member

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    Its weird to see what would be a commuter train go so fast.
     
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  19. MYG92

    MYG92 Well-Known Member

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    Not that weird I take some commuter trains that reach speed like 140 kph or 160 kph
     
  20. aglomarsale

    aglomarsale Well-Known Member

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    125mph
    200kmh
     

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