Tube Deep Below

The Robertson Tunnel under the city's West Hills (formally, the Tualatin Mountains) is three miles long, and its construction presented some significant engineering challenges in the building of  Westside MAX in the second half of the 1990s. 

There is a single stop along this portion of the line, Washington Park.  At 260 feet below the surface it's the deepest urban transit station in North America.  Zoo and park patrons use high speed elevators to reach the outdoors.    

This photo gives some indication of how large the bore is at the station.  Smaller tubes carry each of the two tracks from Washington Park to the outdoors on either side of West Hills.  Trains can be heard when they are far, far off -- long before, and after, their lights are visible.

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