"RailRoad (Civ1)"@en . . "Railroad allows the building of Darwin's Voyage and railroads, which increase troop movement between cities substantially and increases that square's production. It is a prerequisite of industrialization."@en . . . . . . . "Railroad allows the building of Darwin's Voyage and railroads, which increase troop movement between cities substantially and increases that square's production. It is a prerequisite of industrialization."@en .