Rails and Siding

Rails noun - A bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll.

Siding and rails are semantically related. In some cases you can use "Siding" instead a noun "Rails".

Siding noun - Material applied to the outside of a building to make it weatherproof.

Rails and siding are semantically related. Sometimes you can use "Rails" instead a noun "Siding".