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Thread: Two pylons? Or Three? Help me decide

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    Question Two pylons? Or Three? Help me decide

    I'm 3D printing a highway overpass that will span the width of my layout. In one section, it crosses three rails and I'm trying to decide which pylon configuration looks the best? Which is most prototypical? I'm curious for your opinions...

    2018-10-22 21.29.22 (Large).jpg 2018-10-22 21.29.30 (Large).jpg

    2018-10-22 21.29.45 (Large).jpg 2018-10-22 21.29.39 (Large).jpg
    Peter

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    My vote goes for three.
    I think it looks more balanced that way?
    The Little Rock Line blog


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    I like the 3 as well for the same reasons Allen does . But highway spans can easily do the 2 pilons .

    Steve

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    Without seeing the rest (say if the bridge was supported by something else) 2 looks unnatural. It'd cost capacity with no real benefit
    Did someone say whitcomb?

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    I vote for two piers, the span doesn't look long enough to need three. Plus those things are really expensive to build, they wouldn't put in a third if they didn't need it.

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    Here's a pic of the scene in progress. 4' wide part iof the layout. The left end of the bridge will be "floating" near the edge of the layout. The middle part of the roadway will be built on the hilltop (no bridge there). The white foam board surface is temporary to get a sense of what it will look like.

    2018-10-22 22.27.07 (Large).jpg
    Peter

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    It definitely looks more balanced with three.
    Director of Operations of the Kettle River Railway

    See photos of the original owner's layout here:
    https://m.flickr.com/#/photos/about-...7603977732928/

    It sounded like a good idea at the time... too bad the caboose wasn't in on the plan.

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    I think it looks better with three.
    "It's not whats best......It's whats best for you"

    Gary

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    like what dwe said. maybe find real life prototypes that are similar sized spans?

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    Will the bridge be supported at the abutments , then I think 1 would be the prototypes choice.
    As long as I can model in N-scale, I know I'm not old

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    Era plays a role here.

    If this was built in the 1960's, likely 3. They couldn't build steal beams big enough and strong enough for one economically.

    Today, likely 1. Bigger beams are no problem, and it would cut costs to have one in the middle. Heck, depending on span it may be zero.
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    I think 3 looks the best to my eyes. Either way going to be a great looking scene.

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    I say 3. Looks balanced

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    Looks vs. prototypical might be at odds here.

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    Quote Originally Posted by kingmeow View Post
    Looks vs. prototypical might be at odds here.
    I think that's my struggle. I like the three, but two is more prototypical.



    Quote Originally Posted by bicknell View Post
    Era plays a role here.
    Modern layout, so I can go with either.


    Quote Originally Posted by bicknell View Post
    Heck, depending on span it may be zero.
    Probably could go zero but I'll need at least one near the edge of the layout to hold up the floating end!



    Quote Originally Posted by Janbouli View Post
    Will the bridge be supported at the abutments , then I think 1 would be the prototypes choice.
    Yes, there will be proper abutments at the hillside.




    The thoughts on "one" are something I hadn't considered. Here's how that looks:
    2018-10-23 07.45.34 (Large).jpg
    Peter

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    If you are doing one as Janbouli suggested, I would put it between the two tracks or even to the right of the right most track, not off to one side in your previous picture.

    Another alternative is to check the typical spacing for columns in the era you are modeling (via pictures and other info). Then do some scale mathematics to figure out if you need 1,2 or 3.

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    I think two supports looks best. With 3 pylons the spans seem much too short. With just 1, the depth of the beams doesn't look thick enough.

    I'm very much looking forward to seeing the development of this scene!
    Cheers!
    Gordon
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    How about sitting a semi truck and/or car so you can judge the size a bit better.
    The Little Rock Line blog


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    Quote Originally Posted by kingmeow View Post
    If you are doing one as Janbouli suggested, I would put it between the two tracks or even to the right of the right most track, not off to one side in your previous picture.
    That was my first thought too, but I'd worry about the floating end with that much of a "diving-board" overhang.
    Peter

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    Place a "concrete" foundation at the far right end, then I think it would look about right. At least from a Northern New England point of view

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