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The trains come in 6 colours, slot together with ease and can be measured on the train tracks. The space between sleepers on the tracks, the windows on the carriages and the wheels all measure 10mm, giving a unique way of measurement by numerous methods. Features: measurement in metric units, counting up to 20 and beyond, addition and subtraction up to 20, colour sorting, identifying sizes, patterns and sequencing. Includes: 15 double sided Cards, 16 Train Tracks, 24 Engines and 96 Carriages.