The Ljubljana Bus Station, the Ljubljana central bus hub, is located next to the Ljubljana railway station. The city bus network, run by the Ljubljana Passenger Transport (''LPP'') company, is Ljubljana's most widely used means of public transport. The fleet is relatively modern. The number of dedicated bus lanes is limited, which can cause problems in peak hours when traffic becomes congested. Bus rides may be paid with the Urbana payment card (also used for the funicular) or with a mobile phone. Sometimes the buses are called ''trole'' (referring to trolley poles), harking back to the 1951–1971 days when Ljubljana had trolleybus (''trolejbus'') service. There were five trolleybus lines in Ljubljana, until 1958 alongside the tram.