mrt

MRT stands for Mass Rapid Transit in the context of urban rail transport. It is a high-capacity, urban rail system designed for frequent service, grade separation from other traffic, and fast travel across metropolitan areas. The term is widely used in Asia, where several cities run networks branded as MRT or under similar names.

Singapore's Mass Rapid Transit is the best-known example, with its first line opening in 1987. The network has since expanded to multiple lines serving most of the city-state. Tracks are electrified, typically through a third-rail collection system, and the system includes both traditionally operated and automated lines. The MRT is managed by public agencies in coordination with train operators, and it forms a core element of Singapore's public transport strategy.

Other cities with MRT networks include Bangkok, Taipei, and Kuala Lumpur, each with its own lines that combine underground and elevated sections, varying automation levels, and interoperability with other transit modes. In many systems, the MRT operates alongside suburban rail or light rail networks.

Outside transportation, MRT can mean other terms. In German-language medical literature, MRT stands for Magnetresonanztomographie (magnetic resonance tomography); in English, MRI is standard. MRT can also refer to mean residence time in pharmacokinetics or other technical terms depending on context.