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Weld defect (repairs of surface defects)
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A defect in the head of the rail that occurs as the result of aluminothermic or arc weld repair to the running surface of the rail. it may manifest into any of the head and surface defects outlined above. visual detection is only possible after the defect has reached a surface.
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Shatter crack, английский
A defect originating as a series of small hydrogen inclusions or cracks in the head of a rail. this defect is likely to exist throughout the length of the rail and is characterised by a series of closely spaced internal defects that occur within the head of rail. shatter cracks are likely to progress to transverse defects.
Emergency isolation, английский
A de-energising of part or the whole of the overhead traction, no isolators are opened and no permit to work is issued.
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