Question: Friedel Klussmann is credited with leading the campaign that saved the San Francisco cable car system,which forms part of the intermodal urban transport network operated by what railway?

Context paragraphs:
Wendelstein Cable Car: The Wendelstein Cable Car (Wendelstein-Seilbahn) is a 2953 m long cable car (US: aerial tramway) running from Bayrischzell Osterhofen to Mount Wendelstein.  It has a maximum speed of 10 m/s (36 km/h ) and its travel time is 6.5 minutes.  The cabins each take up to 50 passengers, and the cable car system has a transport capacity of 450 people per hour.  The cable car climbs an altitude difference of 932 m .

Eibsee Cable Car: The Eibsee Cable Car, which opened in 1963, is a cable car which connects the lower station (973 m above sea level) near lake Eibsee with the top station at 2950 m above sea level next to the summit of Zugspitze, Germany's highest mountain on the border to Austria.  The cable car was built to provide a faster access to the Zugspitze from its German side, as the cog railway from Garmisch-Partenkirchen does not go directly to the summit and takes much longer.  The "Eibsee Cable Car" belongs to "Bayerische Zugspitzbahn Bergbahn AG", the company operating the cog railway and most cable cars, gondola lifts and chairlifts in the Garmisch-Partenkirchen area.  It is thus possible to make round trips using both the cog railway and the cable car.  On the Austrian side, there is the Tyrolean Zugspitze Cable Car which starts at Ehrwald and meets the Eibsee Cable Car on the top.

Urban traffic modeling and analysis: Urban traffic modeling and analysis is part of the advanced traffic intelligent management technologies that has become a crucial sector of Traffic management and control.  Its main purpose is to predict congestion states of a specific urban transport network and propose improvements in the traffic network.  Researches rely on three different informations.  Historical and recent information of a traffic network about its density and flow, a model of the transport network infrastructure and algorithms referring to both spatial and temporal dimensions.  The final objective is to provide a better optimization of the traffic infrastructure such as traffic lights.  Those optimizations should result into a decrease of the travel times, pollution and fuel consumption.

Andrew Smith Hallidie: Andrew Smith Hallidie (March 16, 1836 – April 24, 1900) was the promoter of the Clay Street Hill Railroad in San Francisco, USA.  This was the world's first practical cable car system, and Hallidie is often therefore regarded as the inventor of the cable car and father of the present day San Francisco cable car system, although both claims are open to dispute.  He also introduced the manufacture of wire rope to California, and at an early age was a prolific builder of bridges in the Californian interior.

Singapore Cable Car disaster: The Singapore cable car disaster was a deadly event on the Singapore Cable Car system that occurred at about 6 p.m. on 29 January 1983, when the derrick of the "Eniwetok", a Panamanian-registered oil rig, passed under the aerial ropeway and struck the cable that stretched over the waterway between the Jardine Steps Station and the Sentosa Station.  As a result, two cabins plunged 55 metres into the sea, killing seven people.  The oil rig was being towed away from Keppel Wharf when it became entangled in the cable and caused it to snap.  It also left thirteen people trapped in four other cabins between Mount Faber and Sentosa.  The disaster was the first involving death or injury since the cable car system opened in February 1974.

San Francisco Cable Car Museum: The Cable Car Museum is a free museum in the Nob Hill neighborhood of San Francisco, California.  Located at 1201 Mason Street, it contains historical and explanatory exhibits on the San Francisco cable car system, which can itself be regarded as a working museum.

Mérida cable car: The Mérida Cable Car (Spanish: "Teleférico de Mérida" ) or Mukumbarí is a cable car system in Venezuela.  Its base is located in the Venezuelan city of Mérida at an altitude of 1640 m , and its terminus is on Pico Espejo, at 4765 m .  It is the highest and second longest cable car in the world for just 500 meters, but is in first place for being the only one which combined such height and length.  Mérida Cable Car is a journey of 12.5 kilometers, reaching a height of 4,765 meters, making it an engineering marvel that is one of a kind and has over 40 years of history.  The whole system was opened to the public in 1960; it was closed indefinitely in 2008, with a declaration that it had reached the end of its service life and is being rebuilt.  In 2011 it began a project of total modernization of the cable car which promised to become the most modern in the world.  In April 2016 it re-opened its doors to the public.

Friedel Klussmann: Friedel Klussmann (1896 – 1986) was a prominent member of San Francisco society.  She is credited with leading the campaign that saved the San Francisco cable car system in the 1940s and 1950s, and the foundation of the San Francisco Beautiful organization in 1947.

3S Cable Car: The 3S Cable Car (Europe), 3S Gondola Lift or 3S Aerial Tramway (US) is a cable car system that was developed by the Swiss company Roll transport systems in Thun to unite the benefits of a gondola with those of a reversible cable car system.

San Francisco cable car system: The San Francisco cable car system is the world's last manually operated cable car system.  An icon of San Francisco, the cable car system forms part of the intermodal urban transport network operated by the San Francisco Municipal Railway.  Of the 23 lines established between 1873 and 1890, only three remain (one of which combines parts of two earlier lines): two routes from downtown near Union Square to Fisherman's Wharf, and a third route along California Street.  While the cable cars are used to a certain extent by commuters, the vast majority of their 7 million annual passengers are tourists.  They are among the most significant tourist attractions in the city, along with Alcatraz Island, the Golden Gate Bridge, and Fisherman's Wharf.  The cable cars are listed on the National Register of Historic Places.

Supporting paragraphs: Friedel Klussmann San Francisco cable car system
Answer: San Francisco Municipal Railway