TT gauge: Tri-ang and British (87) - ABS (1)

This is classic British TT scale: 3mm/ft or 1:101 scale running on 12mm track, as defined by Tri-ang in 1957. It is not compatible with the new Hornby TT120 range even though the gauge is the same, the scale, couplings and wheels are all significantly different.

For contrast:

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