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TEMPLOT 3D PLUG TRACK - To get up to speed with this experimental project click here.   To watch an introductory video click here.   See the User Guide at Bexhill West.

  • The Plug Track functions are experimental and still being developed. Some of the earlier pages of this topic are now out-of-date.

    For an updated overview of this project see this topic.   For some practical modelling aspects of using Plug Track see Building 3D Track.

    The assumption is that you have your own machines on which to experiment, or helpful friends with machines. Please do not send Templot files to commercial laser cutting or 3D printing firms while this project is still experimental, because the results are unpredictable and possibly wasteful.

    Some pages of this and other topics include contributions from members who are creating and posting their own CAD designs for 3D printing and laser-cutting. Do not confuse them with Templot's own exported CAD files. All files derived from Templot are © Martin Wynne.
  • The Plug Track functions are experimental and still being developed.

    For an updated overview of this project see this topic.   For some practical modelling aspects of using Plug Track see Building 3D Track.

    The assumption is that you have your own machines on which to experiment, or helpful friends with machines. Please do not send Templot files to commercial laser cutting or 3D printing firms while this project is still experimental, because the results are unpredictable and possibly wasteful.

    Some pages of this and other topics include contributions from members who are creating and posting their own CAD designs for 3D printing and laser-cutting. Do not confuse them with Templot's own exported CAD files. All files derived from Templot are © Martin Wynne.

Split Deflection Trap/Catch point

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R

richard_t

Member
Location
nr Spalding
Hi

Not sure if the subject is the correct term, but the D Road on Manchester Central had a trap/catch point similar to this:

1645436233946.png


I thought I had a photograph of it, but having looked through my collection over the weekend, I can't find it, or I was mistaken. I think the reason for this kind of arrangement for the trap/catch point was down to platforms 8/9 and the D Road (the centre road between the platforms), were on a timber extension to the main building, and in the event of a run away, these where designed to try to keep the vehicle upright, and not send it crashing through the deck. Obv. I'm could wrong on that.

But how would the switch blades have worked? Or perhaps the blades would have been offset by a sleeper, rather than opposite each other. One of the signalling diagrams I have shows the switch numbers, but at the time of the diagram, platforms 8-9 and all the centre roads had been taken out of use. Another diagram shows it as a conventional trap/catch point with only one switch (and numbered 71)

Any help would be appreciated.

Thanks

Richard
 
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@richard_t

Hi Richard,

It's called a Wide-to-gauge Trap. Often used on a middle loop between running lines to keep the derailed vehicle in line without fouling the running lines each side.

There is a picture and more discussion here:

https://www.rmweb.co.uk/community/index.php?/topic/100730-unusual-trapcatch-point/

The picture shows a set of reversing cranks on the far side to operate the opposite switch blade.

We have discussed them here before:

https://85a.uk/templot/archive/topics/topic_2457.php

https://85a.uk/templot/archive/topics/topic_2338.php

https://85a.uk/templot/archive/topics/topic_3458.php :)


800px-WHR_Cae_Pawb_trap_points.jpg

CC BY 3.0 Herbert Ortner - Own work

A similar arrangement is quite common on London Underground on the turnback loops. In that case they are known as Double-Acting Traps because each switch rail can operate independently as a Y-turnout.

cheers,

Martin.
 
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Thought the mountain looked like Snowdon, though looking at the link perhaps not, I know you can see it from the cob but far away. I thought it might be further along past Bedgelert
 
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Last edited:
It must have passed over the standard gauge line at some point, I have had a quick look through Boyd but haven't seen anything yet. I will look later to satisfy my curiosity, when I have time to wade through the jungle of financial stuff that is of little interest to the enthusiast.
 
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Stephen Freeman said:
It must have passed over the standard gauge line at some point, I have had a quick look through Boyd but haven't seen anything yet. I will look later to satisfy my curiosity, when I have time to wade through the jungle of financial stuff that is of little interest to the enthusiast.
Click to expand...
I didn't feel a thing :)

It still does cross the standard gauge coming into Porthmadog. Unfortunately, Google Maps doesn't apparently consider that North Wales warrants higher resolution satellite photos.

Cheers,
Paul
cae pawb.PNG
 
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Stephen Freeman said:
Wow, how many years since I've been there! I see there is a Bypass too now!
Click to expand...
Last time I was there, the bypass was still being built, and the WHR hadn’t reached Porthmadog - we could only travel between Caernarfon and Rhyd Ddu. Summer 2020 was to be the year I returned, then 2021. Maybe this year? Photos suggest that Harbour Station is pretty unrecognisable now that it has to accommodate Garratts with much longer trains along the Cob.
 
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Having found the relevant map in Boyd (JIC of course), it looks like they used the original alignment that was the Croesor Tramway.
 
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