Before the influx of automobiles, Spokane's electric streetcar and interurban lines played a dominant role in moving people and goods around Spokane. Streetcars were installed as early as 1888, when they were pulled by horses. Many older side streets in Spokane still have visible streetcar rails embedded in them. Streetcar service was reduced due to declining ridership beginning in 1922, and by August 1936, all lines had been abandoned or converted to motor buses. Mass transportation throughout the Spokane area is provided by the Spokane Transit Authority (STA), which operates a fleet of 156 buses. Its service area covers roughly and reaches 85 percent of the county's population. A large percentage of STA bus routes originate from the central hub, the STA Plaza in downtown Spokane. Spokane has a Transit Score of 35.4 on Walk Score. Spokane has rail and bus service provided by Amtrak and Greyhound via the Spokane Intermodal Center. The city is a stop for Amtrak's "Empire Builder" on its way to and from Chicago's Union Station en route to Seattle and Portland. Amtrak's through service to Seattle and Portland is a legacy of BNSF Railway's old Spokane, Portland and Seattle Railway trackage. Spokane is a major railway junction for the BNSF Railway and the Union Pacific Railroad and is the western terminus for the Montana Rail Link.