|
|||
author | remove search highlighting | ||
---|---|---|---|
posted: 31 Aug 2020 22:13 from: ScottW
click the date to link to this post click member name to view archived images |
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
click the date to link to this post click member name to view archived images |
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?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
click the date to link to this post click member name to view archived images |
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 |
||
Please read this important note about copyright: Unless stated otherwise, all the files submitted to this web site are copyright and the property of the respective contributor. You are welcome to use them for your own personal non-commercial purposes, and in your messages on this web site. If you want to publish any of this material elsewhere or use it commercially, you must first obtain the owner's permission to do so. |