- leithead B Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
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- B gauge | UIC B gauge
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- Definition an international gauge, agreed by UIC (International Union of Railways), for which the total height wagon ÷ ITU 4.08 m above the rail and 1.28 m on either side of the track axle Reference SEC: Terminology on Combined Transport, 2000, UNECE, p.12