Question: When did the cable cars start in the place Love on a Rooftop is set?

full_context: Document 1: London: London's first and only cable car, known as the Emirates Air Line, opened in June 2012. Crossing the River Thames, linking Greenwich Peninsula and the Royal Docks in the east of the city, the cable car is integrated with London's Oyster Card ticketing system, although special fares are charged. Costing £60 million to build, it carries over 3,500 passengers every day, although this is very much lower than its capacity. Similar to the Santander Cycles bike hire scheme, the cable car is sponsored in a 10-year deal by the airline Emirates.
Document 2: San Diego: San Diego is served by the San Diego Trolley light rail system, by the SDMTS bus system, and by Coaster and Amtrak Pacific Surfliner commuter rail; northern San Diego county is also served by the Sprinter light rail line. The Trolley primarily serves downtown and surrounding urban communities, Mission Valley, east county, and coastal south bay. A planned Mid-Coast extension of the Trolley will operate from Old Town to University City and the University of California, San Diego along the I-5 Freeway, with planned operation by 2018. The Amtrak and Coaster trains currently run along the coastline and connect San Diego with Los Angeles, Orange County, Riverside, San Bernardino, and Ventura via Metrolink and the Pacific Surfliner. There are two Amtrak stations in San Diego, in Old Town and the Santa Fe Depot downtown. San Diego transit information about public transportation and commuting is available on the Web and by dialing "511" from any phone in the area.
Document 3: I Love Lucy: Originally set in an apartment building in New York City, "I Love Lucy" centers on Lucy Ricardo (Lucille Ball) and her singer/bandleader husband Ricky Ricardo (Desi Arnaz), along with their best friends and landlords Fred Mertz (William Frawley) and Ethel Mertz (Vivian Vance). During the second season, Lucy and Ricky have a son named Ricky Ricardo Jr. ("Little Ricky"), whose birth was timed to coincide with Ball's real-life birth of her son Desi Arnaz Jr.
Document 4: Matt Saracen: Julie visits Matt in Chicago on her way back to college after an incident with her History TA. Even though Julie says that she does not fit in Matt's life anymore, the two quickly resume their relationship. Before Julie leaves, Matt tells her that they will figure out a way to make things work. Matt surprises Julie and his grandmother by returning home for Christmas. He tells Julie that he wants to be with her forever and proposes, in front of the Alamo Freeze. Despite worries from Coach Taylor and Tami, the young couple convinces them that they are making the right choice. In the final moments of the series, which occurs eight months later, the two are shown happily living together in Chicago.
Document 5: List of Barcelona Metro stations: Lines L1, L2, L3, L4, L5, L9, L10, L11 and the Funicular de Montjuïc are administered by Transports Metropolitans de Barcelona (TMB), the city's transit company. Lines L6, L7, L8 and L12 are in origin commuter train services with extended frequency and integrated into the metro network, numbered as such, and run by the public Ferrocarrils de la Generalitat de Catalunya (FGC), which belongs to the Catalan government or Generalitat de Catalunya.
Document 6: Fisherman's Wharf, San Francisco: Fisherman's Wharf is a neighborhood and popular tourist attraction in San Francisco, California. It roughly encompasses the northern waterfront area of San Francisco from Ghirardelli Square or Van Ness Avenue east to Pier 35 or Kearny Street. The F Market streetcar runs through the area, the Powell-Hyde cable car lines runs to Aquatic Park, at the edge of Fisherman's Wharf, and the Powell-Mason cable car line runs a few blocks away.
Document 7: Everybody Loves Raymond: The show is centered on the life of an Italian - American everyman named Raymond Barone, a sportswriter for Newsday living with his family in Long Island. Beleaguered, diffident and dryly sarcastic, Raymond takes few things seriously, making jokes in nearly every situation, no matter how troubling or serious. He often avoids responsibilities around the house and with his kids, leaving this to wife Debra.
Document 8: What's Happening Now!!: In the series, Roger ``Raj ''Thomas (played by Ernest Thomas) has become a fledgling writer. He bought half of the restaurant Rob's Place (renamed Rob's) and was running the business with Shirley (Shirley Hemphill), making money for himself and his new wife Nadine (Anne - Marie Johnson), who was a social worker. Dwayne (Haywood Nelson) has become a computer programmer, and Rerun (Fred Berry) a used - car salesman. Raj and Nadine live in Raj's childhood home while Rerun and Dwayne share an apartment.
Document 9: One Day at a Time: Ann Romano, a divorced mother, moves from their home in Logansport, Indiana, to Indianapolis with her daughters, the rebellious Julie and the wisecracking Barbara. Ann frequently struggles with maintaining her role as mother while affording her daughters the freedom she never had as a young woman. Ann begins dating her divorce lawyer, David Kane (Richard Masur). They become engaged and call it off on their wedding day, when David says he wants kids, but Ann does not. Dwayne Schneider, the building's quirky superintendent (most often referred to only by his last name), provides usually unwanted advice to the tenants.
Document 10: San Francisco cable car system: San Francisco cable car system Cable car on Powell Street Overview Owner San Francisco Municipal Transportation Agency Area served Chinatown, Financial District, Fisherman's Wharf, Nob Hill, Russian Hill, Union Square Locale San Francisco Transit type Cable car Number of lines Line number 59 Powell - Mason 60 Powell - Hyde 61 California St. Number of stations 62 Daily ridership 20,100 (2014) Annual ridership 7,409,400 (2014) Headquarters San Francisco Cable Car Museum Website sfmta.com Operation Began operation California St. line: 1878 Powell - Mason line: 1888 Powell - Hyde line: 1957 Operator (s) San Francisco Municipal Railway Reporting marks MUNI Character Street running with some reserved right - of - ways Number of vehicles California St. line: 12 double - ended cars Powell - Mason / Hyde lines: 28 single - ended cars Train length 1 grip car Technical System length California St. line: 1.4 mi (2.3 km) Powell - Mason line: 1.6 mi (2.6 km) Powell - Hyde line: 2.1 mi (3.4 km) No. of tracks Track gauge 3 ft 6 in (1,067 mm) Top speed 9.5 mph (15.3 km / h) hide System map
Document 11: 500 Days of Summer: David Ng of the Los Angeles Times describes architecture as a star of the film. Tom is seen reading Alain de Botton's The Architecture of Happiness. The film was originally set in San Francisco but was later moved to Los Angeles and the script rewritten to make better use of the location. Buildings used include the Los Angeles Music Center (which includes the Dorothy Chandler Pavilion) and the towers of California Plaza. The older Fine Arts Building is featured in the film, in a scene where Tom shows it to Summer and mentions its designers, Walker and Eisen, two of his favorite architects, although he incorrectly gives the partners' names as ``Walker and Eisner. ''
Document 12: Full House: In season two, Danny is reassigned from his duties as anchor by his television station to become co-host of a new local morning TV show, Wake Up, San Francisco, and is teamed up with Nebraska native Rebecca Donaldson. Jesse and Becky eventually fall in love and get married in season four. In season five, Becky gives birth to twin sons, Nicky and Alex.
Document 13: Love on a Rooftop: Love on a Rooftop is an American sitcom about a newlywed couple, Dave and Julie Willis, and their humorous struggles to survive in San Francisco on Dave's apprentice architect's salary of $85.37 a week. Matters were complicated by the fact that Julie's rich father did not approve of their less than luxurious lifestyle and often took it upon himself to try to improve it, much to Dave's chagrin.
Document 14: Miami: Miami's heavy-rail rapid transit system, Metrorail, is an elevated system comprising two lines and 23 stations on a 24.4-mile (39.3 km)-long line. Metrorail connects the urban western suburbs of Hialeah, Medley, and inner-city Miami with suburban The Roads, Coconut Grove, Coral Gables, South Miami and urban Kendall via the central business districts of Miami International Airport, the Civic Center, and Downtown. A free, elevated people mover, Metromover, operates 21 stations on three different lines in greater Downtown Miami, with a station at roughly every two blocks of Downtown and Brickell. Several expansion projects are being funded by a transit development sales tax surcharge throughout Miami-Dade County.
Document 15: London Underground: London Underground A deep - level Central line train at Lancaster Gate bound for Ealing Broadway A larger sub-surface Metropolitan line train at Farringdon bound for Aldgate Overview Locale Greater London, Buckinghamshire, Essex, Hertfordshire Transit type Rapid transit Number of lines 11 Number of stations 270 served (260 owned) Daily ridership 5 million Annual ridership 1.379 billion (2016 / 17) Website London Underground Operation Began operation 10 January 1863; 154 years ago (1863 - 01 - 10) Operator (s) London Underground Limited Reporting marks LT (National Rail) Technical System length 402 km (250 mi) Track gauge 1,435 mm (4 ft 8 ⁄ in) standard gauge Electrification 630 V DC fourth rail Average speed 33 km / h (21 mph)
ground_truth: 1878
sub_queries: Which place is Love on a Rooftop in? Answer: San Francisco
when did cable cars start in San Francisco Answer: 1878