Seattle's light-metro uses light rail vehicles, giving it the flexibility to operate on lesser rights-of-ways.

Seattle’s Light metro Abandons $507 Million Tunnel

Seattle’s so called light rail system is in reality a light metro system that uses light rail vehicles. Over 90% of the system is grade separated either in subway or on elevated guide-ways. In the United States, light rail has morphed into light metro and light metro is very expensive when compared to classic light [...]

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Seattle’s Light Metro Too Expensive?

Seattle’s light rail system is really a light-metro system, with over 70% of its route grade separated either on viaduct or in a tunnel (subway), yet ridership is dismal. This not because the system uses light rail vehicles, but because Seattle’s politicians at all levels wanted a ‘world class’ transit system to ensure Seattle’s world [...]