Rail, n.
 1. A bar of timber or metal, usually horizontal or nearly so, extending from one post or support to another, as in fences, balustrades, staircases, etc.
 2. Arch. A horizontal piece in a frame or paneling. See Illust. of Style.
 3. Railroad A bar of steel or iron, forming part of the track on which the wheels roll. It is usually shaped with reference to vertical strength, and is held in place by chairs, splices, etc.
 4. Naut. (a) The stout, narrow plank that forms the top of the bulwarks. (b) The light, fencelike structures of wood or metal at the break of the deck, and elsewhere where such protection is needed.
 5. A railroad as a means of transportation; as, to go by rail; a place not accesible by rail.
 Rail fence. See under Fence.
 Rail guard. (a) A device attached to the front of a locomotive on each side for clearing the rail of obstructions. (b) A guard rail. See under Guard.
 Rail joint Railroad, a splice connecting the adjacent ends of rails, in distinction from a chair, which is merely a seat. The two devices are sometimes united. Among several hundred varieties, the fish joint is standard. See Fish joint, under Fish.
 Rail train Iron & Steel Manuf., a train of rolls in a rolling mill, for making rails for railroads from blooms or billets.