Rail (noun)

1. A bar of wood or metal fixed horizontally for a specific purpose, such as a fence or barrier.
2. A bar or beam used to support or guide something.
3. A metal bar or beam used in a railway to guide and support the trains.

Origin:

From middle english rail, reil, from old english rægel ("rail, rod, bar"), from proto-germanic *ragilaz ("rod, rail"), from proto-indo-european *hreǵ- ("to straighten, make straight").

Examples:

1. The fence had rails made of wood.
2. The ladder had rails to hold on to.
3. The train was running on the rails.
4. The rail system was an important part of the city's transportation.
5. The rail was bent from the impact.