The Mont Cenis Pass Railway on the border with Italy was 77 km ( 48 mi ) long .
The Mont Cenis Pass Railway on the border with Italy ran from 1868 until superseded by a tunnel under the pass in 1871 .
The Mont Cenis Pass Railway on the border with Italy was 77 km ( 48 mi ) long and ran from 1868 until superseded by a tunnel under the pass in 1871 .