For original Euro 2 Cummins M11 Units, the options of gearbox included Voith DIWA 863.3/864.3/864.3E and ZF Ecomat 5HP590.

For later Euro 3 Cummins ISMe/ISM Units, the options of gearbox included Voith DIWA 864.3E and ZF Ecomat 2 5HP602C.

[citation needed] The other 5 were all delivered to Hong Kong, two went to Kowloon Motor Bus and three to Citybus.

[2] The second prototype was finished and delivered to Hong Kong in May 1997, also having an ALX500 body and the KMB air-conditioned bus livery.

KMB adopted the class code ATR for Trident 3, which would also be used to number the production models.

It was delivered to Hong Kong later and entered service in 1999, with fleet number ATR101, meaning it is the 101st Trident 3 registered under KMB.

Furthermore, 25 of the Long Win Tridents were built with coach standard, and are used for express services into the airport.

KMB adopted the code ATR for its own Tridents, and assigned the code LW for the Long Win batch with ordinary standard (The numbering of LW class starts from 11, continuing from the 10 Volvo Olympians acquired by Long Win earlier in 1997).

The next 110 of them are again 12 metres in length, and fitted with electronic route displays (This became the standard of all future buses bought by KMB).

Two of them were experimentally fitted with Cummins ISMe Euro III standard engines and have special livery.

These buses are fitted with electronic displays and Cummins ISMe Euro III standard engines, and have their bodies similar to the last 10.6-metre batch.

One KMB Alexander-bodied Trident [Fleet number ATR6 (HV6943)] was destroyed by fire accidentally on 27 November 2002.

For the coach standard branch, 11 Alexander-bodied Tridents entered service in late 1997, followed by 50 Duple Metsec-bodied examples.

A total of 60 semi-coaches entered service in 1998 to 1999 (although one of them stayed in Britain until its final delivery in 2000), while the following 40 (The last two were essentially 23-prefixed) were considered as ordinary standard buses.

Citybus also purchased the first 10.6m Trident 3 built by Dennis, which has Duple Metsec semi-coach body.

They were fitted with luggage racks in the lower deck in 2007 to facilitate the introduction of new cross-border routes B3 and B3X from Tuen Mun via the Hong Kong–Shenzhen Western Corridor.

The coach standard buses began withdrawal when the Alexander Dennis Enviro500 MMC was introduced in June 2013 and 10 were sold to New Lantao Bus and Kwoon Chong Motors for usage on Lantau Island due to the requests of double deckers.

It was rumoured that China Motor Bus (CMB) had thought about purchasing ten Tridents in late 1996, but due to unpredictable delivery time Condors were bought instead.

A slightly later batch of 40 Tridents (Fleet numbers 3301–3340) were fitted with specially-designed Duple Metsec bodywork.

These buses were designed for both height and length restrictive road conditions in the hills of Hong Kong Island, including the ones leading to The Peak.

These buses' fleet numbers originally included an "L" (for Low height) at the end, but removed some years later.

NWFB's expansion in its early years proved to be too fast, and redundancy grew up fairly quickly.

Nine 12-metre Tridents in the last batch (fleet number 1201-1209) were transferred to Citybus in 2003, only one year after their entry of service.

1220 was converted to an open-top bus for tourist and hiring services and the fleet number was changed to 25.

BC Transit was the only North American operator to order transit-type Trident 3s, before the model was discontinued and replaced with the Enviro500.

However, due to the large number of Trident orders from Hong Kong, these buses only entered revenue service in July 2001[8] and were deployed to Hougang Bus Depot throughout their lifespan.

Coach USA of the United States introduced 30 Trident 3s for its Gray Line sightseeing services.

[9] They were all entered service in 2001 and allocated to Twin America LLC (New York City - Gray Line/City Sightseeing) and Chicago (Coach USA).