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What tolerances of gauge does IR permit?

April 26, 2017gauge IR permit tolerances

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What tolerances of gauge does IR permit?

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Broad Gauge Deviations allowed from nominal gauge: -5mm to +3mm on straights and curves over 350m radius, and up to +10mm on curves sharper than 350m radius. (The older specifications were: On straight sections, a deviation of +/- 6mm; and on curves a deviation of up to +20mm/-6mm.) High-speed sections (130+ km/h) have tighter tolerances of +/- 2mm. Meter Gauge Deviations allowed from nominal gauge: -2mm to +3mm on straights and curves over 290m radius; and up to +10mm on curves sharper than 290mm radius. (The older specifications were: On straight sections, a deviation of +/- 3mm, and on curves a deviation of up to +15mm / -3mm; on particulary sharp curves the deviation could be up to +20 mm.) Narrow Gauge Deviations allowed from nominal gauge: -3mm to +3mm on straights and curves over 400m radius; up to +10mm on curves between 100m and 400m radius, and up to +15mm on curves sharper than 100m radius.