The COMS models its railway in N Scale which is 1:148 in the UK and 1:160 in the USA. Both scales are acceptable and run on our N Gauge track (9mm between rails). Members model in their own scales of interest, ranging from plastic Thomas the Tank Engine layouts, the popular HO/OO scale, tiny Z Gauge and even historic metal Marklin track.
The club builds its layout in pieces called 'modules' which bolt together. Club members can build their own modules at home, then bring them along to a meeting or display and join them in to a big layout. We mix and match whatever modules we choose, so it is not often that our full layout looks the same. Our module standards are loosely based on the US NTrack module system, though we define our own standards.