Introducing my OO fine-scale micro-layout project “Trethosa”.   Trethosa is my interpretation of what might have been if things had turned out differently. In reality Trethosa siding was located to the south of the main Drinnick Mill branch, diverging near the present-day Kernick sidings. There is a 1930s photograph (plate 53) in Maurice Dart’s book “West Cornwall Mineral Railways”. It closed in 1948 due to expansion of Trethosa clay pit; but what if the geology had been different and the pit