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1st message | this message only posted: 28 Sep 2007 02:46
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from:
Martin Wynne
West Of The Severn, United Kingdom



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There has been an interesting discussion about catch* points on RMweb:

 http://www.rmweb.co.uk/forum/viewtopic.php?t=8908

with some interesting pictures.

Here are a couple more:



Nemuro Main Line, JR Hokkaido.

This is a set of catch* points at Castle Cary:



You can see the two-level baseplates under the rising turnout rail, and also the inner rail stops short of an extended check rail -- as in the GWR design which I posted earlier. The photographer obviously felt brave enough to go up on the footbridge! :)

Notice some timber shoving in the foreground.

Here's another pic of the same:



*Templot is about track so we'll use the traditional p.w. term "catch points". Nowadays the S&T dept. and the rule book call these "trap" points -- trailing "catch" points are the ones used on gradients.
 
regards,

Martin.
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2nd message | this message only posted: 14 Feb 2008 13:38
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from:
rodney_hills
United Kingdom

 

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Hello,

Another 'catch point' photo just spotted on RMweb inter alia something else:

 http://www.rmweb.co.uk/forum/download/file.php?id=5233

From this page:

http://www.rmweb.co.uk/forum/viewtopic.php?f=7&t=17768

scroll to stob11.jpg at end of longish page ~~> some modern FB 'trappage' at Willesden Jct.

Regards,

Rodney Hills

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3rd message | this message only posted: 16 Apr 2008 05:53
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from:
BeamEnds
 

 

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Er, points to protect a foul move have always been trap points (they were certainly referred to as such in the Rule Book, Sectional Appendicies etc during my time on BR 1979- 1983), points to catch runaways on a running line always approrpately named catch points. As our instructor explained, "Trap points trap you in, catch points catch you out" (the catch points bit being a reference to single line working). It could also be argued that catch points are, be definition, un-controlled (i.e. spring loaded with no levers, requiring clipping for wrong-road working), whereas trap points will always be controlled by some means.

Cheers
Richard

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4th message | this message only posted: 16 Apr 2008 09:33
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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.
BeamEnds wrote: Er, points to protect a foul move have always been trap points (they were certainly referred to as such in the Rule Book, Sectional Appendicies etc during my time on BR 1979- 1983), points to catch runaways on a running line always approrpately named catch points. As our instructor explained, "Trap points trap you in, catch points catch you out" (the catch points bit being a reference to single line working). It could also be argued that catch points are, be definition, un-controlled (i.e. spring loaded with no levers, requiring clipping for wrong-road working), whereas trap points will always be controlled by some means.
Hi Richard,

We have been over this ground several times both here and on RMweb. :)

The terms you are describing refer to the function of the points, i.e. the terms used by the signalling and operating staff.

The physical object was nearly always known to permanent way staff as catch points, and was described as such on the manufacturing drawings.

So you can say "a set of catch points was installed in the siding as trap points". But trap points don't have to be catch points. Often a full turnout is used as trap points, leading to a short spur or sand drag.

Templot is about track, not signalling, so we use the traditional p.w. term for the actual object, i.e. a set of points designed to derail vehicles. :)

regards,

Martin.
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