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Thread: Maximum gradient change

  1. #1
    Join Date
    Nov 1999
    Jacksonville,, FL, USA.

    Cool Maximum gradient change

    I believe this topic has been kicked around over the years but in laying track for
    the L&N Main Stem (CSX calls it the Main Line Sub.) I realized that one feature
    of this line, especially between Bowling Green and Horse Cave, KY is the
    "hog backs". The railroad generally follows the terrain, although over the years
    cuts have lowered the tops, and fills have raised the bottoms. This would
    require more abrupt grade changes than I usually set.

    After experimentation, I found that a change of .1/10M did not produce a jerk
    and made for an interesting appearance ahead of the train at grade changes.
    Although not a hogback, this will be especially noticeable going north out of
    Gallatin, TN where the track dips down several meters to cross Station Camp
    Creek right at the end of the Gallatin siding, and then immediately turns up

    When I thought about this, .1 in terms of MSTS is .175% in engineering terms.
    This means there is a change of about .2 feet in 32.8 feet, i.e. 2.4 inches.
    Previously I used .05 in terms of MSTS, and will likely do that in the future
    on some routes. Max. speed on this one will be 79mph for passenger.

    There will be a lot of on-line industries and a few branches on this route so
    that should provide a lot of fodder for the activity creators. Then as I
    mentioned in other posts, if the era is set in 1945-1971, there are a number
    of passenger trains on the line. SouthWind, Pan American, Hummingbird,
    Azalean, Eastern Express, Night Local, seasonal Florida Arrow. One freight
    was named the "Silver Bullet".

    J. H. Sullivan

  2. #2
    Join Date
    Jun 2013


    I've been using .3% as a maximum for a while now. Not the smoothest, but it gets the job done

  3. #3
    Join Date
    Aug 2002
    Poteau, OK, USA.


    Like ebnertra, I use .300 per change. That results in an ever so slight movement of the train that signals the virtual engineer there's a grade change. Seeing are is no "seat of the pants" feel in simulation that actual engineers rely on, this is my substitute for lack of "feel". Works for me.

  4. #4


    I've been using the permille feature....

    Maximum increments for me is 3%% (0.3%) which is slightly noticeable but not bad.

    Increments of 1%% (0.1%) are silky smooth.

    Sent from my SM-G981U using Tapatalk

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