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Gauge, guard rail
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The distance between the guarding face of a guard rail and running edge of a running rail, measured across the track at right angles to the running edge.
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Gauge (track), английский
The distance between the inside running (or gauge) faces of the two rails, measured between points 16 mm below the top of the rail heads.
Double check gauge, английский
The distance between the guard edges of double check rails.
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