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                                       Make branch track parallel
     
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1st message | this message only posted: 6 Jan 2018 17:38
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chrisveitch
Sunderland, United Kingdom

 

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Apologies for this very simple request from an outright beginner, but I've been unable find anything to guide me on this one - I probably just haven't watched the right tutorial yet.
  
In the screen shot below I want PR026 to curve from turnout TL025 and run parallel (at the standard double track spacing) to the straight containing TL037. As you can see I've been able to create the branch track but have no idea how to get it run parallel to the existing straight, although I'm sure this is very straightforward. 

Regards,

Chris Veitch


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2nd message | this message only posted: 6 Jan 2018 18:03
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from:
chrisveitch
Sunderland, United Kingdom

 

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To save anyone the bother I've now found this:

tools->make return curve
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3rd message | this message only posted: 6 Jan 2018 18:52
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from:
Martin Wynne
West Of The Severn, United Kingdom



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chrisveitch wrote: To save anyone the bother I've now found this:

tools->make return curve
Hi Chris,

Yes. :)

But it is not always the best result. Depending on the position of the boundary between the two turnout templates, the return curve may be too short (needing an extra short bit of curved double track to reach the straight section), or too long, in which case it won't fit.

Another option would be to change to a parallel type V-crossing on the lower turnout, but with the same problem if the return is too long to fit. Difficult to say from your screenshot.

A better solution is probably to use the make transition function:

1. make MS double track from the upper turnout template. Extend its length.

2. make branch track on the lower turnout template:




3. Using F6, curve it round so that the two centre-lines don't quite cross:




4. click on the background template (the straight track) and then peg/align tools > make transition curve from control template. This will be the result:




5. now delete the two underlying templates. Then click on the lower turnout and:




with the result:



You can now use F4 to extend the length of it as required.

More about this method here:

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

regards,

Martin.

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4th message | this message only posted: 7 Jan 2018 07:55
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from:
chrisveitch
Sunderland, United Kingdom

 

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Thanks for the comprehensive reply, Martin - I'll give it try today.

Regards,

Chris
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5th message | this message only posted: 8 Jan 2018 19:12
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from:
chrisveitch
Sunderland, United Kingdom

 

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Thank Martin - that works fine for straight track.

How would I create this double track along two different curves, i.e. if I already had single track which consisted of a left hand, then straight then right hand? I had a feeling that this might be covered by "Joining Groups" in Gentle Geometry ( http://templot.com/martweb/gs_geometry.htm) but having read through it I now think that's not the case.
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6th message | this message only posted: 8 Jan 2018 20:04
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Hi Chris,

Can you attach a box file or screenshot or sketch showing what you mean?

Generally if you have a string of templates forming a running line, you would use the tools > make double-track function on each one to create a string of templates running alongside.

To link between them, you can use make crossover, make ladder, make return curve, or whatever is needed for a specific site.

Or at the start of a loop from a single line, you could set a parallel type of V-crossing on the turnout. I suspect that may have worked well on your first example, but would probably have needed the turnout to be roamed back a bit to make room.

It is always difficult to make suggestions without the box file. Some things fit the available space better than others. I suggested using make transition because it will work in almost all situations, whereas the other solutions may not fit.

regards,

Martin.

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7th message | this message only posted: 9 Jan 2018 15:50
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from:
chrisveitch
Sunderland, United Kingdom

 

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Hi Martin,
Thanks for that. I've attached a simple BOX file showing an example - there are two curves linked by a straight. Apologies for stringing this one out...

From what you've said, to make this into double track I'd need to select each in turn and use Make Double Track on each of the three segments. I'd assumed that there was some way to group the three into one object and do this in a single action, but it seems that there's not - is that correct?

Regards,

Chris

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Attachment: curve_example_1.box (Downloaded 34 times)
 
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8th message | this message only posted: 9 Jan 2018 17:03
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
chrisveitch wrote: From what you've said, to make this into double track I'd need to select each in turn and use Make Double Track on each of the three segments. I'd assumed that there was some way to group the three into one object and do this in a single action, but it seems that there's not - is that correct?Hi Chris,

That's correct.

Double-track must be made separately for each template. That's because you may need to change the track spacings. On sharp curves more clearance is needed to allow for vehicle overhangs.

However, a string of templates forming a reverse curve such as your example would often be replaced with a single template as an S-curve transition, like this:



Then it would be only one click to create the double track.

Or 2 templates forming an easement transition at each end of the straight. Then it is only 2 clicks to create the double track, like this:



Generally it's not good practice to have a sharp curve connecting directly to a straight track.

regards,

Martin.

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