Yes, the RPTA is Valley Metro. However, the Valley Metro name is used be several different transit agencies in the Valley, the Phoenix Transit Department being one of them. The City of Phoenix actually manages three different transit divisions (North, South, and West), however, the North and South Divisions operate under a single contract (Veolia), with the West Division being separate (First Transit).
The RPTA, on the other hand, manages the transit operations out of the Mesa facility (also operated by Veolia), as well as the Glendale facility (which is operated by Valu Trans/Discount Cab) jointly with the City of Glendale. In addition, the RPTA manages operations of the Gila Bend Regional Connector, which is operated by Ajo Transportation.
Another major agency here is Tempe in Motion, or TIM, which is managed by the City of Tempe and also operated by Veolia. However, there is a proposal to unify Tempe transit operations with the RPTA, where the RPTA will manage operations out of both the Mesa and Tempe facilities. It has been found that unifying the transit operations of both agencies would lead to significant cost savings for both the City of Tempe and the RPTA, and it looks like it is now likely to happen since the estimated cost savings are greater than what was initially expected. A new contract should be awarded soon, and shortly afterward the RPTA and the City of Tempe will vote on an intergovernmental agreement. Since 2009, the City of Tempe has purchased most of its transit buses off the RPTA contract with New Flyer, and currently has an order for 16 New Flyer C40LFRs to replace the rest of the aging NABI 35/40-LFW LNG fleet. They will also be purchasing new ElDorado National 30-foot buses and StarTrans cutaways off the RPTA contract to replace the existing ORBIT circulator fleet.
One more agency is the City of Scottsdale Trolley, which is operated by Ollie the Trolley (aka Dunn Transportation), however, the Scottsdale Trolley does not use the Valley Metro name. However, the City of Scottsdale tends to collaborate with the RPTA at times, for example they are temporarily leasing six NABI 40-LFW CNG
buses from the RPTA as an interim replacement for their ElDorado National EZ
Rider LNG fleet (which were retired last month due to their horrid condition). The NABI 40-LFWs should remain in service with the Scottsdale Trolley until the 30/35-foot Gillig hybrids arrive late this year, which were purchased by the RPTA for the City of Scottsdale. Four of the 30-foot Gilligs will have a full trolley replica package, while the rest of the Gilligs will simply be painted like trolleys.
[Edited 2013-01-16 10:54:45]