RTA Rapid Transit (generally known as The Rapid) is a rapid transit, light rail, and bus rapid transit system. The system is owned and operated by the Greater Cleveland Regional Transit Authority (GCRTA). The system serves Cleveland and surrounding areas in Cuyahoga County. The system currently consists of seven total service lines: one rapid transit rail line; three light rail lines; and three bus rapid transit (BRT) lines. Considered part of the rapid transit system, the bus lines are included on the official rapid transit map. Rail Lines Four rail lines join at Tower City Center in downtown Cleveland, the former Cleveland Union Terminal. Three rail lines share their tracks at Tri-C–Campus District and East 55th stations. This sharing of one route by light and heavy rail trains is quite unusual. The shared stations have connected platforms of two heights to accommodate the two kinds of trains. And the two types of trains both use the same maintenance facility since they both use the same track gauge and same source of power (overhead catenary). Red Line The Red Line, a heavy-rail route, runs in both directions on fully grade-separated rights-of-way built from 1955 to 1968. It serves Cleveland's southwest suburbs, with its southwestern terminus at Cleveland Hopkins International Airport. Heading northeast, the Red Line serves University Circle before heading to its northeastern terminus at the Louis Stokes Station at Windermere in East Cleveland. Blue, Green, and Waterfront Lines The Blue and Green light-rail lines (alternatively known as the RTA Shaker Rapid) were built from 1913 to 1936 as grade-separated lines closer to downtown and surface lines along street medians in the streetcar suburb of Shaker Heights. The two lines part ways at Shaker Square, a historic mixed-use community in Cleveland proper, just west of the Shaker Heights border. The Blue Line veers southeast along Van Aken Boulevard until reaching its terminus near the intersection of Warrensville Center Road and Chagrin Boulevard (U.S. Route 422 and State Route 8). The Green line continues due east along Shaker Boulevard (State Route 87) until reaching its terminus at the intersection of Green Road. The Waterfront Line, opened in 1996, extends the Blue and Green Lines from Tower City north through The Flats. It then travels northeast along the shoreline of Lake Erie, servicing the local Amtrak station and terminates in the Muni lot. The Waterfront light rail line provides access from Tower City