3X: South Line (Zhifu Garden, Pokfulam), such as 37 and 38.
4X: Southern routes (Huafu Village, Huagui Village and Gangxian Bay), such as 40, 4 1 and 42.
5X: South line (Moxingling and Dakouhuan), such as 56 and 57.
6X: South line (Stanley, Repulse Bay), such as 6 1, 62.
7X: Southern Route (Aberdeen), such as 70, 7 1, 72, 73.
8X: Eastern route (Chai Wan), such as 80,81,82.
9X: South Line (Ap Chau), such as 90,91,92.
1xx: cross-sea routes (cross-harbour tunnels have been used), such as 10 1, 102, etc.
2XX: Suburban luxury routes, including 260, 26 1 and 262.
3XX: Holiday routes or special routes (such as swimming season routes 374 and 399; Cemetery routes 357, 388, 389). Besides, CMB also provides 300, 30 1, 302, 303, 305, 307, 336, 337 and 348 cross-harbour routes during peak hours to divert passengers from the MTR and other routes.
5XX: fully air-conditioned service lines, such as 504 and 537.
6XX: Cross-sea route (using Eastern Harbour Tunnel), such as 60 1, 64 1, etc.
7XX: East Corridor Express Line, such as 720, 72 1, 780, etc.
8XX: Sha Tin Racecourse Route
9XX: Cross-harbour routes (using the Western Harbour Tunnel), such as 905 and 970.
English letters
A-C: It refers to a route that is derived from a certain route, but the end points are different. For example, 5A, 5B and 5C are all routes derived from the 5th.
M: Metro connecting lines with the subway station as the main station, such as 25M and 84M.
R: happy valley racecourse route, such as 10 1R, 102R.
X: Temporary special routes, such as 14X and 95X. Later, it was also used for express lines, such as 10X, 43X and 94X ◎ CMB had racecourse lines in 1960s, including:
Star Ferry Pier in Central to Happy Valley Racecourse
Central (Chater Road) to Happy Valley Racecourse
Wan Chai Ferry Pier to Happy Valley Racecourse
◎ To 1980, there is only one connecting route to and from Happy Valley Racecourse:
1M Happy Valley Racecourse to and from Admiralty Subway Station
◎ 1978, CMB and KMB jointly operate the following routes of Shatian Racecourse:
88 1 Shatin Racecourse to Kennedy Town
882 Sha Tin Racecourse to Chai Wan
884 Shatin Racecourse to Aberdeen (via Mid-Levels)
◎ By 198 1, CMB and KMB will jointly operate the following routes from Happy Valley Racecourse to Kowloon Racecourse:
10 1R Happy Valley Racecourse to Kwun Tong
102R Happy Valley Racecourse to Lai Chi Kok (bottom of bridge) (now Mobil)
◎ 1985, 88 1/882/884 ended its service, while 199 1, CMB and KMB reopened two cross-harbour routes at Shatin Racecourse:
802 Sha Tin Racecourse to Shau Kei Wan (later extended to Siu Sai Wan)
8 1 1 CMB only has 1 Airport bus route from Shatian Racecourse to Sheung Wan Macau Ferry Terminal (later to Kennedy Town): A20 Kai Tak Airport-Central (Exchange Square).
With the closure of Kai Tak Airport, the A20 route was also cancelled. Besides, CMB did not participate in bidding for a new batch of airport bus routes between the Hong Kong International Airport and Hong Kong, Kowloon and the New Territories, so there were only 1 airport bus routes from beginning to end. On 1998, after the completion of North Point Yuncheng, a real estate project of which CMB is one of its developers, CMB operated its only non-franchised bus route, sending three buses to and from North Point Yuncheng and North Point Government Offices every day.