MAY | 2025 A paragraph on automated metros provides asnapshot of GoA4 lines worldwide. Other indicators(annual passenger-kilometre (km), annual car-km,and annual vehicle-km) have been collected byUITP, but the limited coverage does not allow forregional comparison. Figures, in this case, are only INTRODUCTION As of 31 December 2023, at least one metro linewas available in 202 urban agglomerations acrossthe world, with 13 new agglomerations opening ametro system in the period 2021-23, reinforcingthe role of metros as crucial assets for efficientandsustainable mobility at the global level.Although at least one new line was opened inalmost all UITP regions, Asia-Pacific still has the After a tremendous fall in ridership due to the 2019coronavirus disease (COVID-19) pandemic andresulting travel restrictions and adaptation to a ‘newnormal’, ridership figures in 2023 were finally backto 2019 levels, achieved at a different pace and with For this metro statistics brief, UITP has collectedexhaustive data on a series of key indicators forglobal urban rail systems running on an exclusiveright-of-way,including network length,fleetsize, number of lines, and ridership. A dedicated‘City selection’ section compares and ranks urban METRO GLOBAL DEVELOPMENTS,2021-2023 METHODOLOGICAL NOTE As indicated in the introduction, 13 urban agglomera-tions opened a metro service between 2021 and 2023,including the first metro network in Sub-Saharan Africa(in Lagos, Nigeria in 2023). In 2023, the total number ofkm of metros surpassed the 20,000km threshold, withan 18% increase compared to the end of 2020. There Definition of metros In this statistics brief, metros are defined by UITP as‘high capacity urban guided transport systems, mostly onrails, powered with electricity and running on an exclusiveright-of-way, with trains composed of a minimum oftwo cars and with a total capacity of at least 100 pas-sengers per train’.Suburban railways (such as the ParisRER, Berlin S-Bahn, and Kuala Lumpur InternationalAirport express line) are not included. Systems thatare based on light rail vehicles, monorail, or magnet-ic levitation (maglev) technology are included if theymeet all other above-mentioned criteria. Suspended Asia-Pacific is by far the region with the highest con-centration of metro systems, hosting 43% of the world’surban agglomerations with at least one metro line andalmost two-thirds of the global metro network length.Together, these two indicators show that metro networksin this region tend to be longer than in other regions. Eu-rope has 21% of urban agglomerations with at least onemetro line, but this region only accounts for 14% of theglobal metro network length. China witnessed significantgrowth in several supply indicators in 2021-23, continu-ing an already growing trend dating back to early 1980s, Methodological note on regions Data has been collected at the urban level and ag-gregated at the national and regional level. Regionspresented in the statistics brief are based on UITPregional divisions, except for Iran and Australia, whichfor statistical reasons are included in the Middle Eastand North Africa (MENA) and Asia-Pacific regionsrespectively. Compared to the previous version of this CURRENT SITUATION (2023) Definition of ‘city’ As of 31 December 2023, there were 202 urban ag-glomerations worldwide with at least one metro line, to-talling 20,453km, as shown in Table 1. Table 1 provides anoverview of some of the key indicators further analysedin this brief, divided by region. The number of metro lines As there is no globally accepted definition of ‘city’, UITPhasadoptedthedefinition of ‘urban agglomeration’ pro-vided by the United Nations and the related populationdataset. An urban agglomeration is defined as“a type ofurban settlement defined by the de facto population con-tained within the contours of a contiguous territory inhab-ited at urban density levels without regard to administrative Asia-Pacific stands out in all the main indicators col-lected, confirming its status as a metro-oriented region.Thanks to massive investment and constantly expandingmetro projects, in 2023, this region accounted for 63%of total global metro length, 58% of total global met-ro cars, and 58% of total global metro ridership. Figure1 depicts the split of these indicators among differentUITP regions. Europe, where the first metro opened in1863, comes in second, with 42 agglomerations with a Collected data has been aggregated according to the ur-ban agglomeration definition, even if the systems are op-eratedindifferentcities(hereafterurban‘agglomerations’and ‘cities’ are used interchangeably for the sake of sim-plicity). As a result, the 237 analysed urban rail networks Figure 2 shows the evolution of the number of urban ag-glomerations with at least one metro line, divided by dec-ade and region. The regional split highlights the constantgrowth in new openings in Asia-Pacific and, from 2010onwards, the MENA region. Betwee