Public transit in Geneva is operated by Transports Publics Genevois (TPG). Following a reorganization of the network in 2011, the system now consists of 4 tram lines, 6 trolleybus lines, and 47 bus lines.
Geneva's first trams were inaugurated in 1862 and in the early 1920s, the network was 75 miles long and the largest in Europe. However, as tram lines were converted to bus lines, the size of the system decreased until only one line was left. Today, there are 4 lines and about 22 miles of tracks.