Are there subways in Chicago

Answer 1

Yes, there are subways in Philadelphia. We have the Broad Street Line which operates a north-south, south-north route. We also have an Elevated line that uses tunnels as well called the Market-Frankford line. It operates on a roughly East-West, West-East manner.

Lines in Philadelphia are color-coded. The Broad Street Line uses orange signage and is sometimes called the Orange Line, while the Market-Frankford line uses blue.

There are also streetcars / trams (green color code) whose routes partially operate in tunnels. Five of these lines run above ground in West Philadelphia, then merge to provide local underground service along the same route as the core of the Market-Frankford line.

Answer 2

Yes, the London Underground is the biggest underground railway system in the world, in terms of length.

Answer 3

yes there are