train. The Red Line splits as well, with southbound trains going either to Braintree or Ashmont. Though most of Boston's rapid transit network is powered via third rail, the outermost portions of the Blue Line, as well as all of the Green Line and Ashmont–Mattapan High Speed Line, are powered via overhead lines. The name "subway" is something of a misnomer; as with other systems, large segments run above ground when far from the city's downtown. Additionally, the Green and Ashmont–Mattapan High Speed Lines are technically light-rail services, using LRVs and streetcars rather than typical multiple unit heavy railcar equipment. The Ashmont–Mattapan line uses refurbished classic pre-war "PCC" trolleys on an exclusive right of way; the Green Line relies on modern high-capacity LRV cars from Japan and Italy. Like the New York City Subway, Boston's subway system in theory does keep to an exact fixed schedule. Starting around 2011, the MBTA introduced overhead displays at the train platform level which indicate estimated arrival times for the next two trains in each direction. In addition, real-time information about train location (and bus location) is available via an Open Data protocol on the Internet, enabling a large number of third-party smartphone apps and web sites to display expected arrival times throughout the MBTA system. The Green Line relies more on operators than its signal system compared to other lines, especially where trams are driven across or even in automobile lanes on surface rails. Due to a sparsity of data collected by the existing system, real-time Green Line arrival predictions are not expected until tracking infrastructure upgrades are completed in 2015. Elevated sections Despite the first rapid transit segment being built underground, many later parts were built as elevated railways. A century later, most of these elevated railway sections have been replaced by cut or tunnel routing. The only remaining classic elevated structures are the Green Line's Lechmere Viaduct, including the Science Park and Lechmere stations, and a short segment of the Red Line at Charles-MGH, connecting the tunnel under Beacon Hill to the Longfellow Bridge. The Boston Elevated Railway was the company that owned all the elevateds and subways. The following Els once existed: Causeway Street Elevated (closed 2004), from the Haymarket Incline to the Lechmere Viaduct Washington Street Elevated (closed 1987), from Forest Hills to an incline north of the Masspike Charlestown Elevated (closed April 4, 1975), from the Haymarket Incline