Have you ever stopped to consider which metro systems in the world are the most extensive? Measuring the most extensive metro system in the world isn’t as cut and dried as it seems. First off, what exactly constitutes a metro? Does it have to be underground? Do we count the number of stations or the length of the track? Generally, the two follow one another closely, but not always. For the purposes of this list, we decided to go with length of track, but we are by no means claiming that this is the best or only way to measure a metro system. Keeping all of this in mind, we bring you the 25 Most Extensive Metro Systems In The World.
Bay Area Rapid Transit (BART)
Serving the San Francisco metropolitan area, BART operates five lines on 104 miles of track with 44 stations.
Short for “elevated”, the L is the rapid transit system serving the city of Chicago and its surrounding suburbs. It’s the second longest rapid transit system in the United States after New York and the third busiest (after New York and Washington D.C.).
Mass Transit Railway (MTR)
The official rapid transit railway system in Hong Kong, the MTR covers 108 miles of track and stops at 82 stations.