Portland light rail system 'MAX' (Metropolitan Area Express):

- 84 stops
- 85 km
- 26 high-floor and, since 1992, 52 low-floor cars
- 4 lines:

Blue Line: Hillsboro - City Center - Gresham:
   Eastside section 24 km, opened Sept 1986
   Westside extension 28.8 km, opened Sept. 1998, includes 4.8 km twin tunnel through West Hills with 1 underground station 'Washington Park'
Red Line: (Beaverton - City Center -) Gateway TC - Airport (8.8 km, opened 10 Sept. 2001)
Yellow Line: City Center (PSU) - Expo Center (9 km, opened 1 May 2004)
Green Line: City Center (PSU) - Clackamas (10.5 km in median of I-205, opened 12 Sept. 2009)

A second downtown route (Portland Mall), served by the Yellow and Green Lines, opened on 30 Aug 2009 (3 km)

Apart from the Light Rail network, Portland also offers a proper streetcar (tramway) operating with modern Skoda low-floor vehicles in the city center.

TriMet (Official Website)

Portland Streetcar (Official Website)

MAX Light Rail at Wikipedia

Lightrail.com

Portland Light Rail at lightrailnow.org

Extensive description at nysubway.org