Templot Club Archive 2007-2020                             

topic: 3649regular or curviform?
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posted: 20 Apr 2020 07:21

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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For the umpteenth time over the years, I have just posted a reply on RMweb explaining the difference between regular and curviform V-crossings, and how the latter can make more space in a cramped yard.

It may as well be copied here:

I fear there is insufficient room in the yard for a loading gauge or a crane
Both of your turnouts need to be changed to curviform type V-crossings. This will improve the line of the curves and make more space. You might find that you could then use shorter turnouts.

To change the type of  V-crossing, click the green R indicator so that it changes to C :

2_200116_490000000.png2_200116_490000000.png

You can see that in a regular V-crossing the part of the turnout marked in yellow is curving in the same direction as the main road. Changing to curviform causes that part of the turnout to curve away from the main road, creating more space between the tracks if the tracks are diverging.

Changing to a curviform V-crossing also eases the diverging radius, in many cases allowing a shorter turnout to be used.

Generally where there is contraflexure in a turnout (negative curving radius), use a regular V-crossing in crossovers between double track. Use a curviform V-crossing in yards and sidings.

More information about types of V-crossings is here:

 http://templot.com/companion/real_track.php

cheers,

Martin.

posted: 30 Apr 2020 21:38

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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I have now made a video expanding on this subject. Also on customizing the exit using TMINP.

 http://flashbackconnect.com/Movie.aspx?id=pu2F-wveux5-EWGYuqPd3g2

I'm not too sure where it belongs in the Companion.

It was originally intended for the beginners' Templot Explained section. But it then got a bit technical with all the ifs and buts. Which everything always tends to do, when I write it. :(

The download link on that page should open in the Templot player, if preferred for better image quality.

cheers,

Martin.

posted: 1 May 2020 11:13

from:

Kenilworth59
 
United Kingdom

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Hi Martin.

From a prototypical point of view, if there was running road that was curving to the right and there was to be a straight branch track off to the left then there's no engineering reason why this would be a curviform right hand turnout?

I think I understand that this is not a done thing in Templot as you would at least not be able to roam the turnout in the running line.

Cheers

Paul

posted: 1 May 2020 12:28

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Kenilworth59 wrote:
From a prototypical point of view, if there was running road that was curving to the right and there was to be a straight branch track off to the left then there's no engineering reason why this would be a curviform right hand turnout?
Hi Paul,

Sorry I didn't quite follow that. :?

If the branch track is to the left, then it's a LEFT-hand turnout in all circumstances. Otherwise the switch deflection would be in the wrong road with a corresponding speed restriction in the running line.

If you want a change of radius in the main road within a single template, the way to do that would be to use a zero-length transition curve at the location of the change: geometry > transition curve > zero-length instant transition at peg. Set a normal transition first.

Then instead of roaming, use SHIFT+F9 slide or CTRL+F5 orbit to take the transition with you. See video at:

 topic 871

cheers,

Martin.

posted: 2 May 2020 14:01

from:

Judi R
 
Sutton-on-Sea - United Kingdom

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Paul, the hand of the turnout is defined by the set of the switches and the turnout road is subject to the speed restriction that Martin refers to.

Judi R

posted: 3 May 2020 09:15

from:

Kenilworth59
 
United Kingdom

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Hi Martin and Judi.

Ah yes, I'd forgotten the set and hence the imposed speed restriction. As my dad used to say, engage brain before putting mouth into gear!

Cheers.



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