August 12, 1998 (June 21) Tiger years, the first batch of dual-fuel buses in operation.

1998, more than 60 vehicles using liquefied petroleum gas and gasoline both fuel bus drive onto the streets of Beijing, marking Beijing buses started using clean fuel.
dual fuel car drivers in the operation of the first to use LPG fuel, gasoline after running out of fuel. This eco-friendly dual-fuel vehicles appearance and ordinary cars compared to no simple technological innovation, it is a liquefied petroleum gas tank and the fuel supply system.
environment in order to protect the capital, the Beijing Public Transport Corporation during the year to prepare modified 1000 pairs fuel vehicles, and building ancillary filling stations.