monthly passes in 2010. BART, Caltrain, Golden Gate Transit, VTA, AC Transit, SamTrans, SMART and San Francisco Bay Ferry also utilize the Clipper system. Fares can also be paid with a mobile app called MuniMobile since 2015. The app is developed by moovel, who have built mobile ticketing apps for a number of other transit agencies such as Caltrain and TriMet. The app is planned to be deployed until around 2021 when the next generation Clipper card mobile app is planned to launch and replace agency-specific ticketing apps. Special service Muni operates 14 express lines, 5 Rapid lines, and 12 Owl lines, which run between 1 am and 5 am. For San Francisco Giants games, additional "baseball shuttles" supplement N Judah and T Third service to Oracle Park. Express lines only run during peak hours; during mornings they run towards downtown (the Financial District) and during the evening they run away from downtown. All express lines have an "X", "AX", or "BX" following the line's number. Some lines are divided into A and B Expresses. The B Express line is shorter and has stops that are closer to downtown, while the A Express makes stops further away from downtown and will make few or no stops in the area where the B Express stops. The 8 Bayshore, as the 8X Bayshore Express, was the only Express route that ran daily until April 25, 2015, the date where it is no longer an Express route. Rapid lines (having an R following their route number) are limited-stop services. They stop at only a subset of the stops of their corresponding "standard" linetypically every third stop and at transfer points. Cable car system Muni also operates the San Francisco cable car system, a heritage streetcar system descendant of a larger network of manually operated cable cars. The first city-owned line was acquired in 1906, although the current configuration is an amalgamation of several former lines and has operated as such since in 1952. The system was designated a National Historic Landmark in 1964 and placed on the National Register of Historic Places in 1966. Heritage streetcars Additionally, Muni operates two heritage streetcar lines distinct from the Muni Metro: the E Embarcadero and F Market & Wharves. Formerly run for the Historic Trolley Festival, in the 1980s, regular service of heritage equipment began in 1995. Streetcars do not utilize tunnel segments and the F