San Diego light rail system 'San Diego Trolley':

- 82 km
- 54 stops

- low platforms
- high-floor (with lift) and low-floor vehicles:
.... 71 Siemens U2 (1980-90) - high floor
.... 52 Siemens SD100 (1993-95) - high floor
.... 11 Siemens Avanto S70 (2004) - 70% low floor

3 lines:

Blue Line: Old Town - San Ysidro/Tijuana
Orange Line: 12th & Imperial - Gillespie Field
Green Line: Santee Town Center - Old Town

26 July 1981: 25.6 km (2.7 km on-street in downtown, rest former railway alignment)
....
10 July 2005: Mission San Diego - Grossmont Transit Center (9.5 km) including San Diego State University (SDSU) underground station

MTS (Official Website)

San Diego Light Rail at nysubway.org with extensive description and many photos

Lightrail.com

TransitRider San Diego includes many photos

LightRailNow

San Diego Trolley at Wikipedia