Elevated railway, also known as an overhead railway, is a type of transport system commonly used in urban areas. While this term is often used, there are several synonyms for this type of railway. Among them are a sky train, high-level tracks, monorail, and elevated metro. Each of these terms refers to the same type of railway system that is elevated above the ground level, working to transport passengers and goods through the city. The term 'sky train' is often used to denote modern and advanced systems, while 'monorail' is typically used to describe a railway system that is powered by a single rail. However, the most commonly used synonym is the overhead railway, which accurately describes its position in the sky.