Valley Metro Rail (styled as METRO) is a 29.8-mile (48 km)[3] light rail system serving the cities of Phoenix, Tempe, and Mesa in Arizona, USA. The network, which is part of the Valley Metro public transit system, began operations on December 27, 2008. In 2023, the system had a ridership of 10,797,600, or about 34,400 per weekday as of the first quarter of 2024.
In the years since it opened in 2008, the system has undergone six expansions (including the infill station at 50th Street/Washington and the Tempe Streetcar), with at least three more scheduled. Furthermore, extensions are underway into West Phoenix at Desert Sky Mall and to South Phoenix at Baseline Road, all of which were expanded as a direct result of obtaining funding under the Proposition 104 sales tax increase.