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"Great Sound♪ Sound Train Video Series" Enjoy the VVVF inverter sound of the Osaka Municipal Transportation Bureau 66 series! ◎The VVVF controller is based on Hitachi 00:00~ Mitsubishi GTO-VVVF Toshiba main motor 9th train 01:00~ Toshiba GTO-VVVF Hitachi main motor 7th train 03:22~ Toshiba GTO-VVVF Hitachi main motor 8th train 04:23~ Hitachi GTO-VVVF Toshiba main motor 12th train Unless you have a really good ear, it's impossible to distinguish between the sounds (lol)