First of all, the video shows a light rail operation, not a train.

But to provide an answer to your question: Simple! The Swiss provide a superior product in a densely populated country with a challenging geography. Quite often travel times by rail, even on narrow gauge operations like the Rhaetische Bahn, are competitive with road travel, due to the geography there.

But why not see for yourself? The country is well worth a visit, and not just for rail adventures. Great hiking, skiing combined with excellent hospitality and viable transportation options make for a winning combination.