metro or light rail lines as part of the larger system under a common name. These are listed, but the light rail lines are not counted in the provided network data. Certain transit networks may match the service standards of metro systems, but reach far out of the city and are sometimes known as S-Bahn, suburban, regional or commuter rail. These are not included in this list. Neither are funicular systems, or people movers, such as amusement park, ski resort and airport transport systems. This list counts metros separately when multiple metros in one city or metropolitan area have separate owners or operating companies. This list expressly does not aim at representing the size and scope of the total rapid transit network of a certain city or metropolitan area. The data of this list should not be used to infer the size of a city's, region's, or country's urban rail transit systems, or to establish a ranking. Legend City Primary city served by the metro system. Country Sovereign state in which the metro system is located. Name The most common English name of the metro system (including a link to the article for that system). Year opened The year the metro system was opened for commercial service at metro standards. In other words, parts of the system may be older, but as parts of a former light rail or commuter rail network, so the year that the system obtained metro standards (most notably electrification) is the one listed. Year of last expansion The last time the system length or number of stations in the metro system was expanded. Stations The number of stations in the metro network, with stations connected by transfer counted as one. System lengthThe system length of a metro network is the sum of the lengths of all routes in the rail network in kilometers or miles. Each route is counted only once, regardless of how many lines pass over it, and regardless of whether it is single-track or multi-track, single carriageway or dual carriageway. Ridership The number of unique journeys on the metro system every year. There is a major discrepancy between the ridership figures: some metro systems count transferring between lines as multiple journeys, but others do not. List ; Table notes Indicates ridership figures based on the fiscal year rather than the calendar year. Table notes Indicates ridership figures based on the fiscal year