The line operated by Kansei Railway Company, which was a private railway, had been in competition with the state-operated Tokaido Main Line, but in 1907 the company was nationalized and its line became the Kansai Main Line.
私鉄であった関西鉄道は、官設の東海道本線と競争関係にあったが、1907年（明治40年）に国有化され関西本線となった。