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topic: 713Regular and generic V-crossings
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posted: 26 Jan 2009 16:41

from:

richard_t
 
Nr. Spalding, South Holland - United Kingdom

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On an interesting thread on RMweb, Camberhurst (P4) - 10800's proposed home layout, you've written:

For diamonds and slips converting to CLM is all you need to do to match P4 Track Co designs. However, for turnouts it's more important also to change from a regular type V-crossing to a generic type (template > V-crossing options... menu item), as that does make a noticeable difference to the lead length. But only for sizes up to the natural sizes -- A7, B8, C10, etc. Stay with the regular type crossing where the angle is flatter than natural for the switch -- A8, B9, B10, C11, etc.

Is this a general thing or just for P4 Track Co designs?

(I'm planning some BS110 curved turnouts which are CLM based.)

Richard.(Having just found references to BS116A flat bottom rail!)

posted: 26 Jan 2009 17:30

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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richard_t wrote:
On an interesting thread on RMweb, Camberhurst (P4) - 10800's proposed home layout, you've written:
For diamonds and slips converting to CLM is all you need to do to match P4 Track Co designs. However, for turnouts it's more important also to change from a regular type V-crossing to a generic type (template > V-crossing options... menu item), as that does make a noticeable difference to the lead length. But only for sizes up to the natural sizes -- A7, B8, C10, etc. Stay with the regular type crossing where the angle is flatter than natural for the switch -- A8, B9, B10, C11, etc.
Is this a general thing or just for P4 Track Co designs?

Hi Richard,

It's a general thing, but depends on your prototype drawing.

If the drawing shows the turnout curve terminating at the fine point (gauge intersection, CTRL-4), use a generic V-crossing.

If the drawing shows a straight section in front of the V-crossing, use a regular V-crossing and set the required entry-straight length.

Introducing a straight section in front of the V-crossing shortens the lead length -- the prototype sometimes does this on natural and sub-natural sizes where space constraints dictate and changing the crossing angle is not possible.

In version 091c you can adjust the entry-straight by mouse action to see the effect and shorten the turnout as required (action > mouse actions: real > adjust V-crossing entry straight menu item).

Templot defaults to a regular type crossing anyway, so that the rails are symmetrical at the knuckle for easier building and smoother running. The shorter lead also saves a bit of space. But the options are there to match the prototype exactly in P4/S7 etc. if you wish.

regards,

Martin.

posted: 26 Jan 2009 19:49

from:

richard_t
 
Nr. Spalding, South Holland - United Kingdom

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Of course - thats what all the tables are for in British Railways Track (ed 3 and 5), with which type of turnouts they are (ed 3: page 117 onwards, ed 5: page 108 onwards). D'oh

Thanks again.



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