XTrapolis

XTrapolis is a family of automated urban rail systems designed for rapid transit. Developed by XTech Rail Systems, it emphasizes driverless operation, modular rolling stock, and interoperability with modern signaling and passenger information networks. The architecture supports underground, elevated, and at-grade alignments, and is intended to scale from short urban shuttles to long metropolitan trunk lines. Energy efficiency features include regenerative braking and energy-efficient duty cycles.

Rolling stock is modular, typically 2–6 cars, with low-floor entry for accessibility. Bodies are aluminum or stainless steel, and configurations may be fixed or articulated. Power is electric, delivered via third rail or overhead, with optional energy storage. Trains run under CBTC, supporting GoA 4 or 5 automation with remote supervision.

XTrapolis networks prioritize high-frequency service, with peak headways of one to two minutes in dense corridors. The system supports mixed traffic in underground, elevated, and street sections, with depots designed to minimize turnaround times and energy use. Networks are designed to integrate with existing urban rail infrastructure and to accommodate future capacity expansions through modular car additions and line reconfigurations.

The program began in the late 2000s, with pilot services and demonstration lines that showcased automated operation and modular car configurations. Several cities adopted XTrapolis for new lines or replacements of older systems, leading to a growing suite of regional deployments and ongoing modernization initiatives.

Variants within the XTrapolis family include XTrapolis Mega for very high-capacity trunk routes, XTrapolis City for dense urban networks, and XTrapolis Flex for rapid deployment and evolving routes. The lineage is characterized by standardization of components to reduce maintenance costs and shorten procurement cycles.