Rail Cars are a railway item in Astroneer. They allows for transporting items and resources along rail lines, with a large slot and can form a train with Rail Cars, Rail Engines, or C.O.L.E.s.
Rail Cars are used to carry items and resources along rail lines and to connected Rail Stations. Rail Cars can form a train (with up to 6 parts) by being placed on a rail, and then attaching additional cars, or a Rail Engine or C.O.L.E.. Rail Cars can move on their own, but an engine will make it move faster.