>>1900175But that's what he said, legacy systems, ie systems built with said gauge that don't make sense to re-gauge. I don't think any new system would be built with metre gauge if it wasn't meant to connect to an existing metre gauge system.
Here in Switzerland there's lots of modern metre gauge light rail lines, one was just opened in the outskirts of Zurich some months ago, but of course they're metre gauge because they join up existing metre gauge tram systems.