curved rail a

Curved rail is a building in the Factorio system representing a curved section of railway track used to construct train paths; it is placed by the player to form curved track segments that connect to adjacent rail pieces and allow trains to navigate turns. As a rail piece, Curved rail complements straight track sections to create continuous routes for locomotives and rolling stock, and its placement affects track layout geometry and signal positioning. Its primary role is to enable turns in railway networks and integrate with the game's train pathfinding and signaling infrastructure.