Passenger traffic over the Gotthard mountain line is now with hourly Regio Express services, run by SBB daughter TILO. A 4 car "Flirt" RABe 524 # 017 is running as RE 4306 from Bellinzona to Erstfeld on the uppermost level of the loops at Wassen.
Acela (US), TGV (FR), Velaro (Ger, although there are British, Chinese and Russian versions as well)
There are other systems, such as the Japanese Shinkansen.