Southern Main Line was created in 1856.
Brighton Main Line was created in 1841.
Caledonian Main Line was created in 1831.
Takayama Main Line was created in 1920.
Nagasaki Main Line was created in 1891.
Sōbu Main Line was created in 1894.
San'in Main Line was created in 1897.
Western Main Line was created in 1856.
Chūō Main Line was created in 1889.
Chichibu Main Line was created in 1901.
Nemuro Main Line was created in 1899.
Nankai Main Line was created in 1885.
the answer to that is the EQUATOR.