Minsk has an extensive public transport system. Passengers are served by 8 tramway lines, over 70 trolleybus lines, 2 subway lines and over 100 bus lines. Trams were the first public transport used in Minsk (since 1892 – the horse-tram, and since 1929 – the electric tram). Public buses have been used in Minsk since 1924, and trolleybuses since 1952.