Since 2006, Shanghai has been the leading Chinese system to implement electric and hybrid buses. During the 2010 Shanghai World Expo, the city piloted a program that includes 256 new energy buses with low to no emission. Some routes are operated by the Shanghai trolleybus system, and although the number of such routes is relatively very small compared to the overall Shanghai transit network, the trolleybus system carries the distinction of being the oldest existing such system in the world (of more than 300 such systems still in operation in 2011); it opened on 15 November 1914.