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topic: 1581Timbering a Scissors Crossing
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posted: 2 Aug 2011 17:17

from:

Alan McMillan
 
Edinburgh - United Kingdom

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Hi all

I'm in a quandry over the timbering of one of my scissors crossings. The diamond's vees and the crossover turnouts' vees don't quite coincide and it leaves me wondering about what to do. Nothing I've tried looks right. Any suggestions would be most welcome.

Regards,

 

Alan
Attachment: attach_1139_1581_Platform_6_Scissors.box 272
Last edited on 2 Aug 2011 17:19 by Alan McMillan
posted: 2 Aug 2011 18:15

from:

Jim Guthrie
 
United Kingdom

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Alan,

I can't mess about with your drawing since it is in a later version than 0.91 and certain things don't seem to want to play ball.  But the easiest way to move your crossings in relation to each other is to vary the double line track centres until you can place them for good checking and easier timber placement.  I couldn't get the ruler in my Templot to work on your drawing so I couldn't measure the track centres you are using,  but it doesn't take a lot of movement in track centres to make a sizeable horizontal change in the placing of the crossings.

Jim.

posted: 2 Aug 2011 21:07

from:

Alan McMillan
 
Edinburgh - United Kingdom

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Hi Jim

Thanks for that, my only problem is the track centres can't be changed. This crossing is part of a much larger plan and is connected on its left to a very complicated junction across six tracks and to its right to a pair of platforms which are in turn connected to two other pairs, the tracks of which are tied together through five double slips. If I changed the centres here, everything else would be thrown off.

I have to find a way to timber this crossing as is.

Regards

 

Alan

posted: 2 Aug 2011 21:48

from:

Jim Guthrie
 
United Kingdom

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Alan,

The other option might be to change the angle of your crossings.  I note you are using 1:10 RAM.  When I reduce that to 1:9.75 the crossing nose seems to move enough to allow easier timber placement - that's if you're not wedded to 1:10. :D

Jim.

posted: 2 Aug 2011 22:25

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Hi Alan,

Often the prototype solves this problem by staggering the two crossovers:

2_021717_000000000.png2_021717_000000000.png

By changing the amount of stagger, it is usually possible to find a timbering layout which picks up all the crossings. It may take quite a bit of trial and error.

And/or staggering, you can use different crossing angles for the two crossovers, perhaps 1:10 for one and 1:9 for the other.

p.s. Jim, the ruler should be working. tools > ruler, then ALT+left click to set one end at the mouse, ALT+right click to set the other end.

regards,

Martin.

posted: 3 Aug 2011 14:37

from:

Alan McMillan
 
Edinburgh - United Kingdom

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Hi Martin

Thanks to both you and Jim for the suggestions. I will try a combination of both staggering and switch angles to get over the problem. I will post the results to let you see how it went.

Regards

 

Alan

posted: 4 Aug 2011 12:39

from:

Alan McMillan
 
Edinburgh - United Kingdom

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Hi Martin & Jim

As promised, here is the scissors crossing with your suggested modifications. I have staggered the two crossovers and varied the crossing angles to enable the timbering to line up across the formation. It looks great now and the longer of the two crossovers works well as it will be the higher speed one of the pair. Thanks again.

Regards,

Alan
Attachment: attach_1140_1581_Platform_6_Scissors.box 253

posted: 4 Aug 2011 12:49

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Hi Alan,

Glad it worked out.

Looking very good. But how about some check rails on the K-crossings? :)

Also, the check rails on the 1:10.9 and 1:11.03 crossings are barely long enough and would be better extended one extra chair towards the switch.

regards,

Martin.

posted: 4 Aug 2011 14:59

from:

Alan McMillan
 
Edinburgh - United Kingdom

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Hi Martin

Is this looking better? I think I might be missing something however...there are check rails on the K crossings.

Regards,

 

Alan
Attachment: attach_1141_1581_Platform_6_Scissors.box 248

posted: 4 Aug 2011 15:19

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Alan McMillan wrote:
Is this looking better? I think I might be missing something however...there are check rails on the K crossings.
Hi Alan,

The longer check rails are much better. :thumb:

Hmm. The K-crossing check rails are ok in TDV but missing when loaded in 091c. :?

I can't guarantee perfect backward compatibility for the .box files, but I don't see any reason for the K check rails to go missing. It needs investigating, so thanks for finding it.

regards,

Martin.

posted: 4 Aug 2011 17:53

from:

Jim Guthrie
 
United Kingdom

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Martin,

Not appearing in my copy of 0.91 either.

Jim.



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