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Old 22nd March 2014, 21:59
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swisstrains swisstrains is offline  
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Join Date: Oct 2005
Location: England
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I believe they are known as track datum plates and they are used to indicate various measurements such as platform height above rail, distance from rail and even cant if on a bend. They will indicate if the track has crept whilst in use and can be used as a reference when carrying out tamping etc.
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