Only nine cities in the world—just one in the United States—have more than 300 kilometers of metro train tracks. Until recently that number was eight.

"With the opening of the Shiv Vihar–Trilokpuri Sanjay Lake section of Pink Line on Wednesday, Delhi Metro will join the league of top metro networks around the world that have an operational length of over 300 km," reports Yogesh Kant.
The opening of the Shiv Vihar–Trilokpuri Sanjay Lake section of the Pink Line brings the total distance added by Delhi Metro Rail Corporation (DMRC) to 80 km this year alone.
Other cities with metro transit systems exceeding 300 km in length, according to Wikipedia:
- Shanghai: 644 km
- Beijing: 599.4 km
- London: 402 km
- Guangzhou: 391.8
- New York City: 380.2 km
- Moscow: 379.1
- Nanjing: 378 km
- Seoul: 331.5 km
- Delhi: 313.7 km

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UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
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Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research