How a single modular train design conquered rapid transit systems in fifty global cities

Countries & Cities · Published 15 October 2026 Swipe more like this →

In short: The Alstom Metropolis is not one train, but a highly adaptable family of electric units found in fifty cities worldwide. From driverless networks in Sydney to luxury carriages in Cairo, this modular system allows operators to customize everything from body width to seating, all while maintaining high-tech reliability.

The Metropolis family, developed by French manufacturer Alstom, represents a shift toward modularity in urban rail. Rather than a fixed design, the Metropolis is a platform that can be scaled to meet specific infrastructure needs. Its body can be constructed from aluminium or stainless steel, with widths ranging from 2.30 to 3.2 metres and lengths between 13 and 25 metres. This flexibility extends to the wheels, which can be either steel or rubber-tyred, and the configuration, which typically spans two to ten cars.

Beyond the physical structure, the Metropolis is defined by its digital and mechanical integration. Many units feature regenerative braking, which captures energy during deceleration to reduce overall consumption. For maintenance, operators use the TrainTracer tool, an internet-delivered system that monitors critical components in real-time. Inside, the trains are designed for passenger comfort and information, utilizing specialized noise-reducing glass called Climavit and integrated Ethernet backbones that support security, public address, and passenger information displays.

The system is perhaps best known for its ability to facilitate automated transit. Alstom often provides the Metropolis as part of a turnkey package, bundling the trainsets with signalling, track works, and services. This has enabled the creation of fully driverless networks, such as the Sydney Metro and Budapest Metro’s fourth line. With over 4,000 cars manufactured and service spanning from Singapore to Montreal, the Metropolis demonstrates how a standardized technological core can be adapted to serve vastly different urban environments and operational requirements.

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