Nominal Breaks of Gauge
The line between Finland and Russia has a nominal break-of-gauge; Finnish gauge is 1,524 mm (5 ft) whereas Russian gauge is 1,520 mm (4 ft 11 5⁄6 in). This does not usually prevent through-running, as the nominal 4 mm (0.16 in) difference is generally within tolerance, and the present Russian gauge is actually a redefinition of the older 1,524 mm (5 ft) .
The Iberian gauge is actually three slightly different gauges. Traditionally in Spain 1,672 mm (5 ft 5 5⁄6 in), traditionally in Portugal 1,664 mm (5 ft 5 1⁄2 in), and the newer redefined 1,668 mm (5 ft 5 2⁄3 in). Through-running is done with vehicles having a gauge within certain tolerances.
Read more about this topic: Break-of-gauge
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