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    • Cubologist posted
    Posted in New South Wales » South Coast Railway Improvements

    What is gradient through Dombarton tunnel?
    How long is it?
    Is it diesel friendly?
    Ideally it should be nearly level, just sloping enough to drain water from it.
    Remember Cascade tunnel in USA! Built too steep and had to be replaced, and more.
    If necessary move the junction up the hill to flatten the grade.
    The diesels should be working at minimum power  to keep fumes as low as possible.
    Diesels can work flat out on the 1 in 30 grade in the open outside the tunnel.
    WimbledonW
    1:30 gradient and 4km long.
    Not practically diesel friendly (look at Ulan #3), intended for electric locomotives

    Edit history

    Edited 16 Aug 2020 10:56, 5 months ago, edited by Cubologist

    What is gradient through Dombarton tunnel?
    How long is it?
    Is it diesel friendly?
    Ideally it should be nearly level, just sloping enough to drain water from it.
    Remember Cascade tunnel in USA! Built too steep and had to be replaced, and more.
    If necessary move the junction up the hill to flatten the grade.
    The diesels should be working at minimum power  to keep fumes as low as possible.
    Diesels can work flat out on the 1 in 30 grade in the open outside the tunnel.
    WimbledonW
    1:30 gradient and 4km long.
    Not diesel friendly (look at Ulan #3), intended for electric locomotives