On April 3, 1922, Gentaro was on a train bound for Kyoto from Sonobe on the Sanin Main Line, which he had been president of prior to the enactment of the railway nationalization law and had been owned by the forerunner of Kyoto Railway Co., Ltd.
1922年4月3日、源太郎自身がかつて社長をつとめた京都鉄道の鉄道国有法後の後身である山陰本線の園部発京都行き列車に乗車中だった。