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１９９９年９月底 ,３００辆装用康明斯Ｂ５．９ -１９５Ｇ压缩天然气发动机的公交客车在北京投入运营 ,排放低于欧洲Ⅱ号标准 ,这是目前亚洲 ,乃至整个世界最大的一支天然气公交客车车队。１９９９年１１月底 ,５０辆装用康明斯Ｃ２２０２０型柴油发动机的公交客车由沈飞客车
At the end of September 1999, 300 bus buses equipped with Cummins B5.9 -195G CNG engines were put into operation in Beijing and were discharged below the Euro II standard, which is now the largest natural gas bus fleet in Asia and even the world. By the end of November 1999, 50 buses equipped with Cummins C22020 diesel engines were delivered by Shenfei Bus