Bus Vehicles The first trolley bus line formally came into operation in 1924, since then on, the situation of Beijing Bus have changed enormously, the total buses increased from 10 to 25409, the bus lines increased from 1 to 800, from single trolley bus to more reasonable multi-operation structure. Notably, in recent years, Beijing Bus picks up its "Green Bus" steps, continuously add CNG, LPG buses to its garages, and Beijing's possession of clean fuel vehicles is ranking the first among cities in the world. Nowadays, public buses have become a beautiful running scenic line in modern metropolis.     [source:]