The Seattle trolleybus system forms part of the public transportation network in the city of Seattle, Washington, operated by King County Metro. Originally opened on April 28, 1940, the network consists of 15 routes, with 174 trolleybuses operating on 68 miles (109 km) of twoway overhead wires. As of spring 2016, the system carries riders on an average of 73,200 trips per weekday, comprising about 18 percent of King County Metro’s total daily ridership. At present in Seattle, a very common alternative term for trolleybus is trolley.
Of the five trolleybus systems currently operating in the U.S., the Seattle system is the second largest (by ridership and fleet size), after the San Francisco system. ~Wikipedia
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