.TH Concept "Railroad"
.NA Railroad "How railroads work"
.LV Expert
Trains are land units with capability \*Qtrain\*U.
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Unlike other units, trains can enter a sector only if it has
(operational) railroad track.
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If option RAILWAYS is disabled, a sector has railroad track as long as
its rail infrastructure efficiency is non-zero.  Train mobility cost
depends on rail infrastructure efficiency (see \*Qinfo Mobility\*U).
Spy and satellite reports show approximate rail infrastructure
efficiency in column \*Qrl eff\*U.
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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
additionally extend track into adjacent sectors that are at least 60%
efficient.  Sector selector track gives the number of operational
railways within one sector range.  Spy and satellite reports show the
presence of track in column \*Qrl eff\*U.  To visualize your railway
network, try \*Qsect # ?track#0\*U.
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.SA "LandUnits"