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Dave

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  1. The levels are 3" apart. I copied Everard Junction's method, see

     

    If you get your levels right then it's down to how good your Loco traction is. I've pulled a rake of 10 coaches but the Loco was protesting at that. 6 or 7 coaches should be no problem if you are pulling up the Helix rather than pushing. I would not recommend a Helix for Steam Locos as a rule but I did manage a rake of 6 coaches with my UTA Jeep.

     

    The main consideration to building a helix is the radius, in 00 radius 3 is the minimum you should go. The smaller the radius the greater the incline so go as big as you can.

    Try to keep the height between levels as low as possible.

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