While visiting a great model railway exhibition in Germany, Pilentum found this amazing model train layout in OO gauge. It was built as an module system, and it’s called “Langley Industrial District Railway”. The small layout is almost a work of art. There are steam locomotives of the Great Western Railway and of the British Railways. OO gauge or OO scale is today the most popular modelling scale in the U.K. 00 gauge respectively 00 scale uses the same track as HO, which is not correct for this slightly larger scale, but it is the most common British standard for model trains.