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Roads and railroads allow units to move longer distances within a turn by reducing the movement costs of terrain.

When a unit is within hostile cultural borders, roads and railroads have no effect, unless the unit has the Commando promotion. When the civilization has an open borders agreement allowing their units right of passage they may freely take advantage of roads and railroads though.

Roads[]

BackArrowGreen.png Back to the Tile improvements in Civ4

Roads can be built after discovering The Wheel. With roads, all spaces cost 1/2 movement points (MP) Movement4.png to enter from other road tiles. After discovering Engineering, the cost goes down to 1/3 MP Movement4.png. In practice this means that a unit with just one movement point can move three tiles using roads. Similarly, units with two movement points can move six tiles.

Railroads[]

BackArrowGreen.png Back to the Tile improvements in Civ4

To build railroads, the civilization first needs to discover the Railroad technology and have an access to Coal Coal (Civ4).png or Oil Oil (Civ4).png. Railroads are similar to roads but they reduce the number of movement points needed to enter a tile from another railroad tile to 1/10 MP Movement4.png.

Railroads also give a bonus of 1 Hammer (Civ4).png to tiles with a Mine, a Lumbermill or a Quarry.

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