In 1900, Chicago already had the second largest cable car network in the country (and, arguably, the city would grow to have the largest streetcar network in the world in a few decades). In 1900, there were three private companies operating 41 miles (66.0 km) of double track routes radiating out from the downtown area. State of the art technology when the first line opened in 1882, by 1900 electric traction had proven superior and in 1906 all cable routes were changed to electrical power. In 2015 most were part of Chicago Transit Authority bus routes.