International Railroad Discussion > Swiss train can run on standard and narrow-gauge track

The Montreux Oberland Bernois (MOB) ralway in Switzerland has introduced rolling stock so trains can make through runs that are partially on standard gauge and partially on meter gauge (3' 3 3/8")track.  While there has for decades been rolling stock that could operate on both standard and broad gauge track (such as Paris-Madrid with standard and 5'6" tracks) my understanding is that this new Swiss operation is the narrowest gauge over which standard-gage compatible rolling stock has ever operated without having to change trucks (bogies).

Apparently service starts on Dec. 11th. I didn't relize it was ready - https://www.railwaygazette.com/passenger/mob-to-launch-gauge-changing-montreux-interlaken-goldenpass-express/63110.article

More info from CNN: https://www.cnn.com/travel/article/golden-pass-express-switzerland/index.html

I believe Spain have also used gauge adjusting equipment. 
https://www.theguardian.com/travel/2022/dec/07/switzerlands-brilliant-new-train-route-direct-from-montreux-to-interlaken
DK