Hitachi GTO-VVVF is my favorite! Greetings from the USA! We don't have as many VVVF drives here in the USA. One that I can think of, is the PL42AC locomotive. It has diesel-electric propulsion, with an Alstom "ONIX" IGBT-VVVF motor drive. /watch?v=aQWNvH4HVDU The New York R160 subway cars also have VVVF, however it has a higher pitch.