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topic: 2648Tandem Points
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posted: 12 Mar 2015 06:32

from:

D Foster
 
United Kingdom

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I was recently asked for images of the sole plates in tandem points.

The first example is at the MRC at Butterely.  The blade tips are so close here that I would tend to call this a three way point rather than a tandem.  I think that there is a sole plate under the first set of blades  - drilled holes in the steel plate are just visible - but there is no sole plate under the second set of blades.

3017_120119_070000000.jpg3017_120119_070000000.jpg


The second example is at Haworth on the K&WVR.  Again the blade ends are very close.  Also, once more, no sole plate for the second set of blades.  First look includes ground levers, connections and stretcher bars.

3017_120125_080000000.jpg3017_120125_080000000.jpg


Second look is close-up/edit of both sets of blade ends - and only one sole plate.

3017_120128_550000000.jpg3017_120128_550000000.jpg



Apologies for hiccups in posting - this is my first attempt...

posted: 12 Mar 2015 06:49

from:

D Foster
 
United Kingdom

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Hmmm...  I recalled another location...

Crewe Coal Sidings...

General view...  This shows the first sole plate nicely.  There is a point clip on the left hand blade of the second set of blades - if you look one timber closer to the camera in the right hand part of the 4ft way you will see an insulated joint in a sole plate

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When the above is edited/enlarged the second sole plate is clearer...

3017_120145_380000000.jpg3017_120145_380000000.jpg

I think that the lug on the soleplate that is on the outside of the chair on the right (to stop the chair being shifted outwards out-of-gauge) is just visible.

Interesting thing about this though is that the sole plate is not under the blades' ends but one timber closer to the camera.


 

posted: 12 Mar 2015 07:01

from:

D Foster
 
United Kingdom

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:-)  Couldn't resist this one in the search...

No sign of a soleplate - but ...

Outside Single Slip with a Trap Point in it...

And this is Crewe Sorting Sidings - non-passenger lines.

Oh - and motor points  :-)

 

 

3017_120159_200000000.jpg3017_120159_200000000.jpg


posted: 12 Mar 2015 07:07

from:

D Foster
 
United Kingdom

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Actually - there are the smallest signs of the ends of sole plates...

posted: 12 Mar 2015 23:03

from:

D Foster
 
United Kingdom

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Okay - here's another 3 way...

Crewe again.

It looks to me as though in some of these examples the blades of the second pair of ends do not end on the same timber...   ???  I will try to check this out.  Annoyingly I was looking at overall appearance when I took these shots - not details...  This always comes back to be a pain...  Then again - I have taken over 1k pics in one day on some trips - and my shoulders get to ache when I do that...

Anyway...

3017_121752_240000000.jpg3017_121752_240000000.jpg


Notice that the sole plate for the first set of blades has a block of steel welded onto it outside each slide chair - to prevent it from being forced outwards and out-of-gauge.  This is standard practice for points... 

Next - an enlargement of the second set of blades...

3017_121757_520000000.jpg3017_121757_520000000.jpg


The insulated joint in the split sole plate is clear - as is the block of steel at the right hand side outside the chair - which doesn't appear to be a slide chair...  The next chair further away appears to be the first slide chair - with the end of the blade on it...

On the left hand side the left hand blade ends on the slide chair on the sole plate...  Is there then a block welded on the sole plate between the two left hand rails?  There is no block to the left of the chair in the left-most rail.

Sorry this is not a better shot...  Possibly some clues here though?

D

posted: 13 Mar 2015 14:37

from:

Matt M.
 
Australia

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Hi D,

The NSWGR refers to 'Sole' plates as 'Tie' plates.
They have been used in any facing point situation from, at least,
the late 1800's. They were fitted by the signalling brach.

The early versions were a one piece with the
both ends turned over. One turned over end was finished with a taper.
This allowed the final setting of the gauge using a wedge to locate
the chair on that side accurately.

I believe they became mandatory here with the arrival of power
operated switches, though I still have to confirm that.

It is indeed the same chair on the outside right hand side with the
welded block. This is an optical illusion.
The reflective surface of the slide is higher than the chair due to
the removal of lower part of the rail during planing to make the switch.
It just looks further back.

The rail brace should have a slight twist on it to compensate for the
joggled stock rail.

There should be a block between the lefthand stock rail and the extreme
outer rail. It is unlikely that the sole plate would stop under the slide chair.
There is no block on the extreme left hand rail as it is not a part of that
switch component and therefore that gauging should not be effected.

Regards, Matt M.



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