The service through the tunnel has evolved from streetcars into light rail, and while there are longer light-rail tunnels elsewhere (such as Portland's Robertson Tunnel), the Twin Peaks Tunnel remains one of the world's longest streetcar or light-rail tunnels.
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Uniquely among Muni Metro stations, the platforms are slightly curved due to the transition from the Market Street Subway to the Twin Peaks Tunnel between this station and the now disused Eureka Station, just southwest.