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topic: 640Catch points detail
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posted: 25 Nov 2008 15:22

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Another fine pic from Mick Nicholson, showing a set of catch points in detail. The left-hand switch blade is in need of adjustment.

catch_points.jpgcatch_points.jpg
© Mick Nicholson

Martin.

posted: 25 Jan 2009 23:04

from:

Howard
 
United Kingdom

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Did some catch points only have blades on one side?

Howard

posted: 26 Jan 2009 18:22

from:

lippydavies
 
 

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Yes some recently removed from Conisborough where one sided.

Lee

posted: 28 Jan 2009 11:43

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Howard wrote:
Did some catch points only have blades on one side?

Hi Howard,

With a single blade it is called a "catch point". With two blades it is a "set of catch points".

A trailing single blade catch point is most often found used as a "runaway catch point" in a rising gradient on double-track running lines. It is sprung in the open position and closes by the action of the wheels. After each wheel has passed, it springs open again.

This means that if a coupling fails on unfitted vehicles, they will be derailed to prevent them running away back down the gradient. Obviously it is always on the cess side of the double track, i.e. for left-hand running it is always a right-hand switch. Such sprung points can't be used on a single-track line.

Double-bladed catch points are used as trap points to prevent unauthorised movements from goods lines onto passenger lines, as in Mick's picture. They are always rodded from the signal box and interlocked in the lever frame. Sometimes a single catch point is used instead, usually where space constraints mean that the catch point must be incorporated within other pointwork.

More about catch points in these topics: click here and here .

There is a short Templot video showing how to insert a set of catch points: click here .

There was a detailed discussion on RMweb about catch points: click here .

regards,

Martin.

posted: 28 Jan 2009 14:18

from:

micknich
 
United Kingdom

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Just to confuse matters, the Walton Street "Catch Point" was spring worked and therefore not rodded to the signal box. Also unusualy the line it was on was nominaly a passenger line with no booked goods traffic. Indeed after July 1955 it had no booked traffic at all. It still remains today as a single line and now of course with a motor worked trap. Mick Nicholson.



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