Once upon a time they ruled the Cross Harbour Tunnel, they were the Dennis Dragon 12m non-AC, the three-door monsters. With a capacity of over 140, most of them were served in the busiest routes until their retirement in 2004. A number of them have been converted into training buses and continue to serve in the bus company. 3N1-3 were in Alexander Body with 2 doors. The remaining ones were in Duple Metsec Body with 3 doors.
DM 3103, the last 12m Dennis Dragon Non-AC, before its retirement, it usually served in routes of Kwai Tsing District.