5.5mm scale is used for modelling narrow gauge railways. 12 mm (0.472 in) gauge track is used to represent 2 ft (610 mm) to 2 ft 3 in (686 mm) gauge prototypes. 16.5 mm (0.650 in) gauge track is used to represent 3 ft (914 mm) gauge prototypes.
Read more about 5.5mm Scale: History
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