Alexander Dennis Enviro500 Hong Kong '02.2013–15

Citybus ordered one new generation Enviro500 in 2011 - 8320 (in conjunction with the 115 older Enviro500), soon followed by further order of 155, 8321 to 8360, 8000 to 8065 and 9100 to 9148. 107 of these were for the 12-metre-long version and included 66 fitted with airport coach specifications. The other 49 were 11.3-metres-long. The first 4 airport coaches entered service in March 2013 and in 2014. Citybus ordered a further 104 new generation Enviro500s which were all the 12-metre-long version and possess a high seating capacity for 90 passengers, 8361 to 8399 and 8402 to 8466.

In mid 2014, Citybus received a 12.8-metre-long Enviro500 demonstrator, 6300 and became the second operator in Hong Kong after KMB to receive such a model. Later that year, the operator received 2 hybrid versions of the Enviro500, 8400 and 8401, becoming the third operator of such a type in Hong Kong. Citybus then went on to order a further 70 new generation 12-metre-long Enviro500s of which the first was delivered in January 2015, 8467 to 8536, increasing the total of 12-metre Enviro500 to 216 in Citybus.

From late 2015, Citybus received further 200 12.8-metre-long Enviro500, but with restyled front and rear. Some were fitted with luggage racks in the lower saloon.

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