City: n/a
Legend
Network stats
Stations
n/a
?
Number of distinct stations after collapsing platforms and interchange complexes.
Lines
n/a
?
Number of logical metro lines (rolled up from GTFS routes that share a line name).
Opened
n/a
?
Year the city's first heavy-rail metro line entered passenger service. Pre-metro era LRTs and the old elevated railways don't count for this date.
City population
n/a
?
Population of the city proper (administrative municipality). Curated figure, not the WorldPop analysis disk. See "Population in area" under More metrics for the value the coverage maths uses.
Metropolitan population
n/a
?
Population of the metropolitan area / urban agglomeration commonly cited for the city. Curated figure, for context alongside the network size.
Metro network km
n/a
?
Metro network length in kilometres: each station-to-station edge counted once, using real GTFS/JTMT shape geometry where available. This is not route-km and not engineering track-km.
Interchanges
n/a
?
Stations served by two or more lines (transfer points).
Population coverage
n/a
?
Share of population (within the analysis radius) that lives within 800 m of a subway station. Source: WorldPop 1 km grid.
Avg station spacing
n/a
?
Average distance between adjacent stations along a line: metro network km ÷ (stations − 1). Lille ≈ 0.72 km, Madrid ≈ 1.15 km. Lower = denser station spacing.
Stations / M pop
n/a
?
Stations per million residents in the metro service area. European 1–3 M cities cluster around 25–55 stations/M.
Metro km / M pop
n/a
?
Metro network km per million residents — captures network reach independent of station count.
More metrics
Stations ≤10 km of centre
n/a
?
Share of stations within 10 km of the city centre (CBD / central transit hub). Lower for sprawling networks. Toggle "Distance-from-centre rings" to see the bands on the map.
Interchanges ≤3 km of centre
n/a
?
Share of interchange stations (2+ lines) within 3 km of the centre — how tightly line crossings cluster around downtown. High in monocentric metros; low where lines share an out-of-centre trunk.
LRT network km
n/a
?
Dissolved tram / light-rail network length from the background layer. Shared route variants and directions are counted once. This is not route-km and not engineering track-km.
LRT / metro network km
n/a
?
Dissolved LRT/tram network km divided by metro network km. n/a means the selected feed has no usable tram/LRT geometry.
Avg line length
n/a
?
Metro network km ÷ number of logical lines.
Avg stations / line
n/a
?
Total stations ÷ number of logical lines (averaged across the system).
Coverage σ (Derrible)
n/a
?
Derrible & Kennedy 2009 coverage index σ = (n_stations × π × 0.5²) / area_served. We use the WorldPop circle area for "area served". See About.
Directness τ
n/a
?
Max number of line transfers needed between any two stations on the shortest path. Lower = more direct system. See About.
Connectivity ρ
n/a
?
Derrible & Kennedy 2009 connectivity index ρ. Higher = more interconnected. See About.
Population in area
n/a
?
Total population sampled within the WorldPop hex layer for this city.
Pop. per station
n/a
?
Population in area ÷ number of stations. Lower = denser station-level service. Standard benchmark in international transit-network comparisons.
Pop. per network km
n/a
?
Population in area ÷ metro network km. Complement to pop/station — captures network reach independent of station spacing.
Articulation points
n/a
?
Stations whose removal would split the network into more pieces — single points of failure.
Avg shortest path
n/a
?
Average number of stops between any two stations on the shortest route. Lower = more compact network.
Diameter
n/a
?
Longest shortest path between two stations, measured in stops.
Robustness r_T (targeted)
n/a
?
Schneider et al. 2011 — fraction of network that survives sequential removal of the most connected stations (adaptive: the next target is re-picked after each removal). Bounded in [1/N, 0.5]; higher = tougher. See About.