Templot Club Archive 2007-2020                             

topic: 3754Turnouts in Transition Curves
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posted: 31 Aug 2020 22:13

from:

ScottW
 
Perth - United Kingdom

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I don’t have any experience building track but I was wanting to know if it was okay to build a turnout in a transition curve? I was under the impression that turnouts should never be placed in a transition curve, so am I asking for trouble?
My latest project (see Share & Show) has a number of transition curves. I was thinking of moving the entry to the turntable/engine shed further round to the right but this would mean that the turnout was in a transition curve.

Scott

posted: 31 Aug 2020 22:44

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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ScottW wrote:
I don’t have any experience building track but I was wanting to know if it was okay to build a turnout in a transition curve? I was under the impression that turnouts should never be placed in a transition curve, so am I asking for trouble?
My latest project (see Share & Show) has a number of transition curves. I was thinking of moving the entry to the turntable/engine shed further round to the right but this would mean that the turnout was in a transition curve.
Hi Scott,

There is no problem on a model, provided you build it flat.

The problems relate to the prototype, where transition curves are normally canted (superelevated). The main purpose of the transition zone is to provide a space for the cant gradient, in which the outer rail gradually rises above the level of the inner rail. That means there is a twist in the track along the transition zone, which would cause problems with moving switch blades. For this reason it is almost unknown for a turnout to be inserted in a prototype transition.

If your entry to a shed is not canted, no such problems apply. On the prototype it would be very unusual to employ a mathematical transition for the entry to a shed. We use model transitions in such locations to disguise the sharp model curves and fit everything in the available space.

cheers,

Martin.

posted: 1 Sep 2020 20:22

from:

ScottW
 
Perth - United Kingdom

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Thanks for that clarification, Martin.

The transition forms part of the run-round loop and was used primarily as a transition from one radius to another. It will certainly be laid flat.

Scott



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