Dennis Trident, is the first low floor tri-axle double-decker bus chassis built by Dennis in the United Kingdom, with a large number purchased by bus companies in Hong Kong, Singapore, the United States and Canada. Design: The Trident chassis was developed from Dennis Lance. It had a longitudinally-mounted rear engine, with a radiator mounted on the right hand side of the engine. An auxiliary axle was mounted behind the second axle to cope with the weight at the rear and reduce the rear overhang. ~Body: Trident was available in 4 different body lengths: 10.3m, 10.6m, 11.3m and 12m. It could be fitted with Alexander ALX500 or Duple Metsec DM5000 bodywork with either a closed top or an open top. Hong Kong: The assembly of the first Trident for Hong Kong was finished in February 1997. It has an Alexander ALX500 bodywork and had Kowloon Motor Bus (KMB) air-conditioned bus livery. However, Dennis reserved this bus for tests initially. 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. When it arrived Hong Kong, it was repainted with a golden colour. A red line indicating the floor of bus compartment was added, with people-like figures (designed with computers) situated just above the red line. This decoration work was for the purpose of showing that this bus is a "Super-low-floor" bus, which has better accessibility for passengers. The bus was assigned for several open activities for promotion before getting licensed in September 1997. It entered service two months later and had been in service on route 1A before being reallocated in 2005. KMB adopted the class code "ATR" for Trident, which would also be used to number the production models. The first prototype was delivered to Hong Kong later and entered service in 1999, with fleet number ATR101, meaning it is the 101st Trident registered under KMB. First batch (1997 to 1999) For the first batch, KMB purchased 186 Tridents for its local services, and another 150 for the new Hong Kong International Airport services under the name of Long Win Bus. All 336 buses of this batch are 12 metres in length. The KMB batch is assorted with Alexander and Duple Metsec bodies, while the entire Long Win batch is Alexander-bodied. Furthermore, 25 of the Long Win Tridents were built with coach standard, and are used for express services into the airport. The Long Win batch entered service first between 1997 and 1998, followed by the KMB batch from September 1998 to 1999. 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 coaches were assigned with the fleet code LWA. Later, Long Win has its fleet number system revised, with the ordinary Tridents getting 1xx or 2xx fleet numbers, while the "coaches" got 5xx fleet numbers. Further purchase (1999 to 2001) The first 50 of them have a length of 10.6 metres (the code ATS was being assigned for them), and entered service between late 1999 and 2000. These buses are the last batch of KMB buses fitted with plastic route number and destination displays. 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). Another 50 Alexander-bodied 10.6m Tridents entered KMB fleet in 2001. These Tridents' Alexander bodies were of a modified model, and all of them have electronic route displays. Two of them were experimentally fitted with Cummins ISMe Euro III standard engines and have special livery. Last batch (2002 to 2003) The last batch for KMB consists of 150 Alexander-bodied Tridents. 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. 50 of the Tridents are 10.6 metres long, while the other 100 are 12 metres long. However, the order of 12 metres long Tridents was revised later and only 80 of them were ordered finally. The remaining 20 became the later TransBus Enviro500. Transfers It was soon found that Long Win did not get expected ridership and was in an excess of buses, so from 1999, 20 Tridents of Long Win were leased to KMB. 14 of them were officially acquired by KMB in December 2002, and the rest were returned to Long Win by 2005. From December 2009 to 2015, Long Win had mass transferred 103 of the first batch of buses to KMB (ATR393 - ATR495). Withdrawals Both KMB and Long Win have some of their Tridents withdrawn prematurely due to fire. Long Win lost one [Fleet number 197 (HT7970)] in July 1999 and got a replacement a year later. This replacement was Duple Metsec-bodied and with electronic displays, and received the fleet number 301 (JV7629).
One KMB Alexander-bodied Trident [Fleet number ATR6 (HV6943)] was destroyed by fire accidentally on 27 November 2002. The accident was caused by the leakage of flammable liquid brought by a passenger into the engine compartment. The bus was officially written off in the following year. In July 2008, two Duple Metsec-bodied KMB's 12-metre Tridents [Fleet number ATR54 (HX7649) and ATR195 (JM8323)], one of KMB's Alexander-bodied 12-metre Trident (ex-Long Win vehicle) [Fleet number ATR358 (HR8939)] and one Duple Metsec-bodied 10.6-metre Trident [Fleet number ATS36 (JK6249)] were written off after being burnt out in KMB's depot in Tin Shui Wai on 31 March 2008. Starting from August 2015, KMB withdrew the first Dennis Tridents out of service. Citybus Citybus's 12m Trident (2144) for Cityflyer routes. Citybus's Trident fleet was not the largest, but often considered with greatest variety. Prototypes After KMB's first Trident was introduced, Citybus also had its prototype Tridents. The first prototype for Citybus was fleet-numbered as 2100. Having a Duple Metsec DM5000 body with coach specifications, it was introduced in November 1997. The second and third prototypes were with ordinary bus specifications, and got their licenses one month after the first. The second prototype was fitted with Alexander ALX500 bodywork while the third was fitted with a Duple Metsec body. They got fleet numbers 2200 and 2201 respectively, in order to distinguish from the "coach" standard model. Production batch The production batches of Citybus Tridents entered service between 1997 and 1999. For the coach standard branch, 11 Alexander-bodied Tridents entered service in late 1997, followed by 50 Duple Metsec-bodied examples. Numbered after the first prototype, their fleet numbers were 21-prefixed. All these buses were used for "Cityflyer" express services into Airport, although the Alexander-bodied frames are often substituted for semi-coaches described below. Fleet numbers 2101 and 2102 were later repainted in a special livery and reserved for route E22A. The first batch of 22-prefixed production Tridents are often considered as "semi-coaches", as they have higher seat standards. 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. It was introduced in 1999 with fleet number 2700. This bus retired at 27th of April, 2017. Later purchases In 2003, Citybus acquired 9 buses from NWFB and numbered them as 2302 to 2310, following its own production batch. 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. Withdrawal Eleven Citybus Dennis Trident 3 buses were withdrawn due to fire and traffic accidents between the years 2010 and 2015, and was replaced by Alexander Dennis Enviro500s. The coach standard buses began withdrawal when the Alexander Dennis Enviro500 MMC was introduced in June 2013 and 10 were sold to New Lantau Bus and Kwoon Chong Motors for usage on Lantau Island due to the requests of double-deckers. The remaining semi-coach and ordinary standard buses started retirement in 2014, and the last were retired in 2018. The transferred batch (2302-2310) were the last to be withdrawn. The last two (2309, 2310) were retired in April 2019. The remaining semi-coach and ordinary standard buses started retirement in 2014, and the last were retired in 2018. The transferred batch (2302-2310) were the last to be withdrawn. The last two (2309, 2310) were retired in April 2019. New World First Bus 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. When New World First Bus won China Motor Bus's franchise in early 1998, plan was put forward of buying Tridents. Between 1999 and 2015, Tridents had accounted for over 50% of buses in NWFB's fleet. All of them have been fully withdrawn by 2020. Continue @comments
