When I'm in charge after the revolution I will mandate that the nomenclature will tell us the scale, gauge and standards. P (Proto) 4 (or 76) S (standard gauge), P87S. U (Universal) 4S would replace 00. C (coarse) 7S, C48S, S10S. Exceptions to standard gauge (broad or narrow) would be indicated by either the gauge of the model track or the gauge of the prototype track.