Alcalá. At that the same time, the South Line (which now traveled north of San Diego) and East Line of the system were renamed the Blue Line and the Orange Line, respectively. One of the system's most ambitious expansions, the Mission Valley East extension, opened on July 10, 2005. The Mission Valley East extension built the only underground station in the system at San Diego State University and inaugurated the third route in the San Diego Trolley system, the Green Line. The line also featured the first low-floor trolley vehicles, that allow passengers to board without climbing stairs and allowed passengers using wheelchairs to use a small bridge plate instead of the slower lifts on the older trains. But, the new vehicles could only operate on the Green Line, forcing passengers heading between Mission Valley and Downtown San Diego to change trains in Old Town. Trolley Renewal Project In the late 2000s, as parts of the San Diego Trolley approached 30 years old, the system was in need of an overhaul of its oldest facilities. Also, after the success of the low-floor trolley cars on the Green Line, the MTS wanted to operate similar vehicles on all lines. Officials secured $660 million in funding after the 2008 election as voters passed the TransNet half-cent local sales tax and two statewide transportation bond measures. The project also received funding from the American Recovery and Reinvestment Act and federal formula funds. The "Trolley Renewal Project" would entail several improvements. Each station would get larger shelters to provide more protection from sun and rain, new benches, and digital “next arrival” signs. Worn-out infrastructure was replaced as needed, including rails, ties, catenary wires, power lines and electrical substations. The project also included a new signalling system that will allow two freight trains to operate at night, rather than one. To enable the switch to a low-floor light rail vehicle (LRV) fleet, platforms at 35 stations would need to be raised from either ground level or sidewalk level () to . Stations also needed a new "safety edge tile" with a smooth surface in the center to allow wheelchair ramps to deploy (the existing safety tile would stop ramps from fully deploying). The other complication of the switch to low-floor LRVs was that the traditional Siemens S70, like those ordered for the Green Line, were over long, so a three-car train would not fit within