Metro Line 9 — Chengdu's first driverless line

🤖 AI-generated summary of the sources below · 🔎 Last verified 2026-07-19

This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.

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Opened in December 2020, Line 9 is Chengdu's first fully automated metro (GoA4, unattended): a 22km orbital line whose 8-car trains run without a driver on Alstom's Urbalis CBTC signalling, watched by thousands of onboard obstacle- and derailment-detection sensors. It launched at the highest automation grade from day one, as the city's rail network passed 500km.

Live 📅 since 2020

Outcome🎯 Succeeded

Evidence📰 Mediagrades the sourcing — this entry states no impact figure

what does this mean?

The strongest source is press reporting; no primary evaluation was located. It grades who did the looking — not how well the project went. All four grades →

Run byUtility or public operator

Scale🏙️ City-wide

🎓 Lesson

Launching straight at GoA4 unattended operation — rather than retrofitting automation onto a driver-run line later — let Chengdu build obstacle and derailment sensing into the fleet from the outset.

🚲 Mobility Public transport Autonomous vehicles Sensors & IoT

Sources

↗ Railway Gazette — Chengdu metro tops 500 km as first driverless line inauguratedIndependent trade press: 18 Dec 2020 opening, 22.2 km orbital GoA4 line, 25 eight-car CRRC Changchun trainsets, 6,000+ onboard sensors, first driverless line in Chengdu.

↗ Alstom — traction and signalling for Chengdu's first driverless metro lineSupplier (authoritative): Urbalis CBTC signalling and OptONIX traction via the CASCO and SATEE joint ventures for Line 9 phase 1.

↗ International Railway Journal — Chengdu awards contracts for first driverless metro lineIndependent confirmation of the GoA4 driverless designation and contract scope.

Continue exploring

Compare this project

🇸🇦 Riyadh Metro · Riyadh Two metros born driverless at GoA4: Chengdu opened its first fully automated line in 2020; Riyadh opened 176 km across six lines in 2024-25. 🇩🇪 Digital Train Control Frankfurt · Frankfurt am Main Chengdu launched Line 9 driverless on Alstom CBTC in 2020; Frankfurt retrofits the same signalling onto its century-old Stadtbahn. 🇪🇨 Quito Metro Line 1: CITYFLO 350 Automatic Train Control Signalling · Quito Two new metros on CBTC signalling: Chengdu's Line 9 is fully driverless (GoA4, 2020); Quito's Line 1 keeps drivers (2023).

Explore the wider context

🚦 Asphalt or algorithms 🚌 Public transport guide 🏙️ Chengdu city profile 🚲 Mobility projects 📖 CBTC (communications-based train control)📖 Grades of Automation (GoA)📖 Personal rapid transit (PRT)

📎 Cite this project

1001 Smart Cities (2026). “Metro Line 9 — Chengdu's first driverless line” — Chengdu, China. The Smart City Atlas. https://1001smartcities.org/projects/chengdu-metro-line9/ (last verified 2026-07-19). Data: CC BY 4.0.

The underlying data is free to reuse with attribution — see the open data page.

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