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Half chain markers

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alxndr

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(Hopefully this is the right section.)

This is something which has been bugging me for a little while, and no one seems to be able to give me an answer aside from "it's the railway", so hopefully someone here will be able to satisfy my curiosity.

In our area we generally have the chain sprayed onto the web of the rail in yellow, with half chain distances marked in between with the symbol below:

15r07s5.jpg


On that occasion it was sprayed onto the wall adjacent, and also included quarter markings, which were rather logically shown with "1/4" and "3/4". Ignore the white writing behind it.

The only thing I can possibly think of is that the symbol is in fact the letters "AI", and is used because they form the middle of the word "chain", but perhaps I'm looking too far into it.
 
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Ploughman

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It is fairly common practice for maintenance staff to make life easier for those patrolling the track and needing a reference location for fault reporting.
Rails or any convenient surface were marked out in miles and chains with the mid point between chains being designated A.

Used to be in use for track surveys but that died out in early 90s since when all surveys were carried out in metric (see other thread about the Metric Railway.)
 
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alxndr

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It's why they opted for A that interests me, the actual marking it is logical. All of the markings I've noticed have never been a normal A though, always with an extra line, as above.
 

Ploughman

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It's why they opted for A that interests me, the actual marking it is logical. All of the markings I've noticed have never been a normal A though, always with an extra line, as above.

Are all the markings you have seen in the same area?
Not just the same station but within a radius of say 20 miles?

If yes then it could be down to the style of the one man who paints them.
 

mcmad

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The line will be the actual point of measurement, the A is the designation of the half.
 
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