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EM means Eighteen Millimetres - the original finescale track gauge adopted by 4mm scale modellers in the mid-1950s. In the 1970s, the gauge of 18.2mm was adopted as part of a re-drawing of the standards.
Are you a 4mm scale modeller who believes the historical 'accident' of 16.5mm gauge can be improved on? The EM Gauge Society is here to help you with products, information and friendly support.