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Unusual Track Features -- A Question

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Dr_Paul

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I've noticed three unusual track features that have been introduced relatively recently, and I wonder if anyone may be able to explain what they are.

On various crossovers, such as at the country end at Wimbledon, there is a metal plate bolted to several of the sleepers in the four foot; it's pretty hefty, half an inch thick or so, and secured by eight large bolts.

Again on various crossovers, such as near Queenstown Road, there is a metal bar clamped or bolted to the sleeper in the four foot; it's at right-angles to the sleeper, about two inches wide and has two inverted V-shaped sections.

At Twickenham, on the up slow line, in the web of the running rail, are small badges (for want of a better word), about an inch square with a circular emblem on them. There are quite a few on them, at roughly six-foot intervals, and are stuck on with an adhesive (a few have fallen off, leaving the adhesive on the rail-web). I've not seen them anywhere else.
 
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swt_passenger

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On various crossovers, such as at the country end at Wimbledon, there is a metal plate bolted to several of the sleepers in the four foot; it's pretty hefty, half an inch thick or so, and secured by eight large bolts.
I think what you are describing is where out of gauge track panel bearers are split for delivery. Basically it is a way of prefabricating long bearers that pass across S&C units, the parts are fastened together on site. Typically delivered to site on NR's tilting wagons - note the holes in the concrete bearer ends here:

http://www.networkrail.co.uk/innovation-and-technology.aspx

Again on various crossovers, such as near Queenstown Road, there is a metal bar clamped or bolted to the sleeper in the four foot; it's at right-angles to the sleeper, about two inches wide and has two inverted V-shaped sections.
That sounds like "lateral restraint anchors", discussed every few months, here's a thread with pictures from a few years ago:

http://www.railforums.co.uk/showthread.php?t=65528

At Twickenham, on the up slow line, in the web of the running rail, are small badges (for want of a better word), about an inch square with a circular emblem on them. There are quite a few on them, at roughly six-foot intervals, and are stuck on with an adhesive (a few have fallen off, leaving the adhesive on the rail-web). I've not seen them anywhere else.

Those sound like 'targets' for an automatic surveying instrument known as a total station. Basically an automatic theodolite 'pings' them to check for unplanned movement during nearby building work. I doubt they'd remove them once work was complete, which might explain why a few are missing.

Did they look like any of these? https://www.sccssurvey.co.uk/survey-equipment-accessories/targets/retro-reflective-targets.html
 
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