If option RAILWAYS is enabled, all highway-like sectors are railways,
and the track is operational as long as the sector is at least 5%
efficient. A sector is highway-like if its mobility cost at 100% is
-zero (column mob cost in \*Qshow sect s\*u). Operational railways
+zero (column mob cost in \*Qshow sect s\*U). Operational railways
additionally extend track into adjacent sectors that are at least 60%
efficient and owned by the same nation. Sector selector track gives
the number of operational railways within one sector range. Spy and