Top 15 longest driverless Metro systems in 2025

Welcome to the electrifying world of GoA4 (Grade of Automation 4) metro systems, where full driverless-ness unleashes hyper-efficient transit magic.

Leading the pack: Riyadh Metro's mind-blowing 176 km behemoth — Guinness World Record holder since January 2025 — powered by Alstom Metropolis tech that's straight out of sci-fi. 

From Dubai's 75 km Red/Green Lines serving 1B+ riders with flawless platform doors, to Vancouver's 80 km SkyTrain Innovia fleet conquering North America, these tech titans slash congestion, boost sustainability, and deliver pinpoint reliability. 

Here is a ranked list of the top 15 longest fully driverless metro systems, classified as “GoA4 systems”, by total network length, based on operational track length. 

#1. Riyadh Metro (Riyadh, Saudi Arabia) - 176 km

The Riyadh Metro is officially the world's longest driverless metro with 6 lines and 85 stations, as per Guinness World Records. Uses Alstom Metropolis and Bombardier Innovia trains with communications-based train control (CBTC) signalling for full automation, The metro opened with three lines in January 2025, attracting nearly 2 million passengers in its first week. 

#2. Dubai Metro (Dubai, UAE) - 75 km

Red and Green lines serve over 1 billion passengers. Employs Alstom Apollo trains with fully automated CBTC (GoA4) and platform screen doors, according to Railway Technology.

#3. SkyTrain (Vancouver, Canada) - ~80 km

Expo, Millennium, and Canada Lines form North America's longest automated network. Utilizes Bombardier Innovia ART with advanced CBTC signalling.

#4. Singapore MRT (Downtown 41.9 km; NEL 22km) - 63.9 km

Currently, the North-East Line, and Downtown Line are full GoA4 systems. There are newer lines like Thomson-East Coast coming up (but not this year). Employs Siemens and Alstom CBTC systems.​

#5. Barcelona Metro Line 9/10 (Barcelona, Spain) - 47.8 km

Europe's longest driverless line with 52 stations. Features Seltrack technology and automatic train control connecting airport and suburbs. A new digital ticketing system, called T-mobilitat, is also in use for public transport, replacing older fare cards.

#6. Shanghai Pujiang Line & Others (Shanghai, China) - ~40 km

Part of expanding automated network; uses Chinese CRRC trains with CBTC. Contributes to over 160 km total automated lines.

#7. Copenhagen Metro (Copenhagen, Denmark) - 39 km

3 lines with 39 stations using AnsaldoBreda driverless trains and OCC (Operations Control Centre) automation.

#8. Toronto Line 1 Yonge-University (Toronto, Canada) ~25 km

Upgraded with Thales CBTC for driverless operation on select sections (partial automation) of this busy line.

#9. Paris Metro Line 14 (Paris, France) - 14 km now, expanding to 32 km later

Fully automated with Alstom MP 89/05 trains and CBTC; connects major hubs with high-frequency service.

#10. London Docklands Light Railway (DLR) (London, UK) - 34 km

7 lines with Bombardier P50 stock and automatic train operation (GoA4 equivalent).

#11. Sydney Metro Northwest (Sydney, Australia) - 23 km

Alstom Metropolis trains with full CBTC automation and platform doors. 

#12. Perth Nighthawk (Perth, Australia) - ~20 km driverless segments

Transperth network uses CBTC on CircleRoute lines for overnight driverless service.

#13. Taipei Metro Circular Line (Taipei, Taiwan) - 17 km (phased)

Uses Hitachi trains with GoA4 CBTC for ring line connectivity. 

#14. Budapest Metro Line 4 (Budapest, Hungary) - 7.4 km

Fully automated with Siemens Inspiro trains and CBTC signalling, as per New Atlas.

#15. Nuovo Transporti Aziende del Municipality (NTM) Line M6 - 4.1 km (part of larger plans)

Mini-metro with automated rubber-tyred trains in Milan, Italy using Seltrack technology.