Some Statistic about the Swiss Rail network:
3658km standard gauge 1435mm, of which 2908km SBB
2km narrow gauge 1200mm (Rheineck - Walzenhausen)
1561km meter gauge 1000mm, of which 74km SBB (Brünig: Luzern - Interlaken Ost)
57km narrow gauge 800mm (cogwheel)
13km narrow gauge 750mm (Waldenburgerbahn: Liestal - Waldenburg)
rack or cogwheel sections 9% to 25% (Pilatusbahn 48%) on all gauges except for 750mm. Tramways (about 172km) are mostly meter gauge, few standard gauge. The network comprises less than 20km of non-electrified lines.
There is one little train with 600mm gauge that offers public transport (TTE Trains Touristiques de l'Emosson) but its infrastructure is exempt from federal rail regulation.