Phoenix, Arizona currently has only bus transit but preliminary construction, moving utility lines, has begun for voter approved light rail. IIRC Phoenix is ranked as the 7th or 9th largest metro area in the US but IMO the makeup of the city and surrounding satellites and suburbs makes that somewhat misleading.
The ten largest metro areas in the U.S. are, as of 1998:
From here. Of these, the previous thread (linked in the OP) established that Houston has no light rail and Detroit has next to none. Not sure about Dallas, and I don’t know if Washington’s & Baltimore’s systems connect (or even if Baltimore has one.) All the same, I would say that the largest U.S. city without any substantial form of light rail is Detroit.
If you’re including full-scale commuter rail, then most European cities can be included. Off the top of my head, UK cities with trams or light rail either running or projected: Manchester, Sheffield, Leeds, Nottingham, Croydon (S London), Liverpool(?)…and don’t forget the Glasgow underground
Houston has just finished construction of a light rail system that is scheduled to open in a month or so. If you consider Galveston part of the Houston metropolitan area, then we’ve got a couple of ferries (Bolivar and Lynchburg) as well.
Oh, and Ottawa has a specialised bus service called the Transitway, which is a dedicated road through town that acts as a trunk line for many of the regular routes, and also as a high-speed, high-frequency trans-urban line. In the latter role it works a lot like a subway or a rail line.
Ottawa also has a short section of light rail in service called O-Train, which they hope to expand in the future.
Dallas has a light rail system that includes most of the surrounding cities as well. There is also a rail system between Fort Worth and Dallas, and eventually between Dallas and Sherman (about 90 miles N. of Dallas). www.dart.org
