Tramways operate in Oslo, Trondheim and Bergen. The only rapid transit system is the Oslo T-bane, while the only funicular is in Bergen. The rail transits are operated by the counties, and the ticket system is integrated into the bus transport. In Oslo the two systems make the backbone of the Ruter public transport system, giving Oslo by far the highest public transport share of 20%.[28] Local trains on the railway is operated by NSB, but monthly passes are integrated into the local transit ticket system.