According to Japanese news reports, a 40 year-old bureaucrat from the Ministry of Health, Labor and Welfare, was recently arrested for groping on Tokyo's Chuo Line.
Between Mitaka Station and Yotsuya Station, the bureaucrat put his right hand on the crotch of another 40-something year-old male and apparently groped the passenger repeatedly for 30 minutes. The victim works for Japan's National Police Agency. When the men finally got off the train, the victim and several other passengers had the accused groper arrested.
警察庁男性技官に…厚労省職員を"痴漢"で逮捕 [TV Asahi]