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                                       Way-beams
     
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1st message | this message only posted: 19 Apr 2018 15:13
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from:
richard_t
Nr. Spalding, South Holland, United Kingdom



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Hi



A recent photograph on ebay showed that on my chosen prototype where a road went under the station the track was on way-beams. I know little about way-beams, so I wonder if I could ask the following:



(These are for bullhead rail)



What would the longest beam be, and if the section of track was longer, would the joints in the way-beams be staggered. The track is straight in all cases in my chosen prototype where it's on way-beams.



Would any rail joints be on the beams? I've seen on the MOD document that rail joints shouldn't be within 4m of the end of the way-beams.



It seems there are cross beams (for want of a better term), between the way-beams every 4 or 5 chairs. Does this seem right and was there a fixed size for the beams?



Finally, on one of the platform roads where the under bridge goes under there's a couple of turnouts. I don't have photographs of this area, but I'm guessing these wouldn't be on way-beams?  



When the station was relaid with flat bottom rail, I think the way-beams where all removed, but I think I'd like to keep them, as it would add a little interest.



Thanks in advance





Richard

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2nd message | this message only posted: 19 Apr 2018 17:35
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from:
Phil O
Plymouth, United Kingdom



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I am unable to have a look on Google Earth,to check, but most if not all the railway bridges over the Thames in London were on way beams.

Phil.
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3rd message | this message only posted: 20 Apr 2018 13:34
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from:
Judi R
Sutton-on-Sea, United Kingdom



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Longitudinal timbers are used where vertical clearances are tight because they save the depth (and weight) of the ballast. They are directly fastened to the steel bridge beams so it's difficult to adjust alignment and are usually tolerated only where necessary in slow speed areas. Yes, I know there are high-speed exceptions. The long timbers are usually 12" x 12" and sometimes bigger, up to 18" x 18", and the cross timbers - the transoms - are usually around 6" x 6" and are paired with a steel tie rod to strap the whole lot tight to hold the gauge.

Judi R
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4th message | this message only posted: 4 May 2018 09:44
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from:
richard_t
Nr. Spalding, South Holland, United Kingdom



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Thanks Judi that was a great help.  I've found a bit of further information in the NERA "Standard Railway Equipment, Permanent Way, 1926" booklet, diagram 107.

It has three arrangements, S1J chairs on 18" beams, L1CC chairs on 18" beams, and M1 chairs on 12" beams. For 60' rails, these chairs are all placed at 2' centres.  Looking at the picture it seems to be M1 chairs, as there's no checkrail visible, and M1/L1 are distinct enough from S1J chairs.

On diagram 107 there are two "chairings", with the 2nd chairing showing the use of a saddle chair (either S1 for S1J/L1CC arrangement, or M1 for the M1 arrangement) under the fishplate. This looks most interesting, so I knocked up these renders.




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5th message | this message only posted: 4 May 2018 16:13
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from:
Andrew Barrowman
USA

 

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So that's why they are called bridge chairs!

Nice 3D model. Are you going to have it printed?

Cheers!
Andy
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6th message | this message only posted: 5 May 2018 09:33
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from:
Judi R
Sutton-on-Sea, United Kingdom



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That's a beautiful picture! Only one niggle, I believe the fishplate bolts should be placed with the heads in the 4-foot.

Judi
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7th message | this message only posted: 5 May 2018 19:12
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from:
Rob Manchester
Manchester



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Judi R wrote: That's a beautiful picture! Only one niggle, I believe the fishplate bolts should be placed with the heads in the 4-foot.

Judi
Judi,
I thought that at first but had a niggle that maybe in this situation there may be reasons for putting the bolts the opposite way to normal. Despite a concentrated look through many books/pictures I haven't found any evidence of this :( The main conclusion I came to was that I didn't have many pictures of rails on bridges !

Rob


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8th message | this message only posted: 6 May 2018 12:24
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from:
richard_t
Nr. Spalding, South Holland, United Kingdom



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Judi is correct - I blame my summer cold :-(
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