新巴母公司周大福企業於二零零三年六月九日成功收購城巴，從這天開始兩巴由昔日競爭對手變成同一集團下的姊妹公司，隨之而來兩巴先後進行路線重組，以達到最大營運效益。經過一輪重組之後，新巴車隊出現過剩情況，於是乎自二零零三年開始陸續出售部份過剩的巴士，其中三十架配亞歷山大ALX500車身的丹尼士三叉戟十點六米，便於二零零四年下旬出售至九鐵巴士部。在此交易進行之前，九鐵巴士部已經向新巴租用一批富豪／利蘭奧林比安，用作行走新界西北一帶的接駁巴士路線。丹尼士三叉戟 Dennis Trident
編號 Class：701 - 747
新巴母公司周大福企業於二零零三年六月九日成功收購城巴，從這天開始兩巴由昔日競爭對手變成同一集團下的姊妹公司，隨之而來兩巴先後進行路線重組，以達到最大營運效益。經過一輪重組之後，新巴車隊出現過剩情況，於是乎自二零零三年開始陸續出售部份過剩的巴士，其中三十架配亞歷山大ALX500車身的丹尼士三叉戟十點六米，便於二零零四年下旬出售至九鐵巴士部。在此交易進行之前，九鐵巴士部已經向新巴租用一批富豪／利蘭奧林比安，用作行走新界西北一帶的接駁巴士路線。
也許是當天因西鐵通車所帶來的接駁服務，不論在需求及模式都超出九鐵估計之內，令到本認為可以削減的接駁巴士服務出現超負荷，不得不令有關當局在這方面再作調整。雖然九鐵巴士向新巴租用巴士，可以紓緩車隊短缺的問題，但長遠來說九鐵巴士部必需自給自足，加上隊中的都城嘉慕都城型巴士已屆退役之齡，購買新巴士絕對是有所必要。可是訂購新車需要進行一連串招標工序，以及付運需時，顯然未能即時解決九鐵巴士部逼在眉睫的情況，碰巧新巴及城巴成為姊妹公司後，新巴因應重整網絡時候出現車隊過剩，有意出售手上閒置的巴士，於是乎促成十點六米版本的丹尼士三叉戟加盟九鐵巴士部。
丹尼士三叉戟對於九鐵巴士部來說絕非新鮮事，早於二零零零年中，九鐵已經購買二十二架配上亞歷山大ALX500車身的十一點三米版本三叉戟新車。雖然同由亞歷山大提供車身，但兩批三叉戟在外觀上還是有少許分別：第一，來自新巴的三叉戟樓梯旁板採用了黑色玻璃襯壁，而九鐵本身購進的新車則採用類似樣板車的設計，只是簡單地用上金屬旁板。第二，九鐵十一點三米三叉戟採用的車身屬於後期的改良版，而新巴則屬早期設計的版本，感覺上較渾圓，尤其從車尾觀看更容易察覺到兩者的分別。
新巴首批出售至九鐵巴士部的十點六米三叉戟，由二零零四年十一月初開始陸續停牌並進行驗車等工序，同時原有的流動乘客資訊系統亦被拆除。當中數部三叉戟(包括前新巴1601/JC6299，九鐵巴士車隊編號701)更於交付前已經重新翻噴九鐵巴士部色彩。 經過一連串準備，首批巴士終於在同年十二月中投入服務，由於急於投入服務，部份成員更帶有新巴色彩以至原先的條幅廣告服務乘客。這批三叉戟在投入服務後，初期主要服務行走屯門的506，K51及K52線，隨著更多成員加入元朗及天水圍區的接駁路線如K73，亦開始出現它們的身影。除了輕鐵接駁巴士，自二零零四年十二月底開始，共有六架「新」車(713 - 718)則獲派到東鐵接駁路線服務，成為首批為東鐵乘客服務的九鐵低地台巴士。為了行走以大棠為總站的K66路線需要，九鐵巴士部率先於720(JC9219)及729(JE9381)兩架三叉戟上安裝車尾倒車閉路電視，成為九鐵巴士部中最先裝有相關設備的巴士，這裝置不單隨後推廣至全數三叉戟，除了都城嘉慕都城型，利蘭奧林比安及三菱MK中型巴士外，全數九鐵巴士部巴士都加裝了車尾閉路電視，進一步提升行車安全。
為了配合輕鐵路線及相關接駁服務重組計劃，以及加快車隊空調及低地台化進度，九鐵巴士部於二零零五年先後再向新巴招手，分兩個批次購買三叉戟以應付需求，當中包括十七架十點六米版本。屬首個批次的十二架三叉戟十點六米於同年三月投入服務，其中741(JC4652)及742(JC5291)被安排駐守東鐵部，行走火炭及大埔墟站的接駁路線。而最後五架十點六米三叉戟則於二零零五年九月加入九鐵巴士部，當中除745(JD1834)被編入東鐵部外，其餘成員全數行走於新界西北服務巿民。跟之前的情況一樣，部份交付予九鐵的三叉戟未有更換車身色彩便派出服務乘客。
隨著九鐵跟地鐵於二零零七年十二月二日合併成港鐵，所有九鐵巴士部巴士，包括全數三叉戟亦於同日開始轉由港鐵巴士部營運，除了東鐵接駁巴士成員，其他行走輕鐵及西鐵接駁巴士都換上了港鐵標誌，取代原有的九鐵標誌。當西鐵線於二零零九年八月十六日延伸至紅磡作終點站，港鐵已經計劃同時取消接駁路線K16停辦，最終K16於同年九月十九日成為歷史的一部份，隨著路線停辦，行走東鐵接駁巴士服務的車隊出現過剩的情況，最終於二零一零年九月開始，服務於東鐵部的十點六米三叉戟全數被轉往西鐵部，至此所有三叉戟亦聚首於新界西北路線。
港鐵巴士於二零零九年年中開始替全數車隊更換車身色彩，首架換上全新港鐵巴士色彩的十點六米三叉戟是743(JC5627)，於二零零九年九月尾以新形象示人，743同時為港鐵巴士車隊中，第四架換上新色彩的港鐵巴士。當排在隊末的747(JC4903)於二零一一年首季完成更換車身色彩時，同時標誌全數十點六米三叉戟已經披上港鐵巴士色彩。除了換上全新車身色彩外，港鐵巴士亦替三叉戟進行車廂翻新工程，進一步改善車廂環境以及配合營運需要。
港鐵巴士自二零一五年開始淘汰這些來自新巴的十點六米三叉戟，737(JD1982)於同年三月五日正式除牌退役，成為隊中首架退役的成員。最終於二零一六年十二月十六日，最後兩架三叉戟719(JC8013)及723(JD1704)於完成早上繁忙時間的工作後，便在返回屯門車廠後正式退役，往日它們奔馳於新界西北各條接駁路線的角色，便由亞歷山大丹尼士Enviro500MMC以及富豪B9TL所取代。
After Stagecoach sold all the City Bus shares to Chow Tai Fook Enterprise which was holding NWFB on 9 Jun., 2003, relationships of City Bus and NWFB were changed from competitors to sister company and a series of routes rationalisation was carried out to optimize the operational efficiency. During the rationalisation, there were surplus buses in NWFB fleet and hence, some of them were sold in the market since 2003 and a batch of 30 Alexander ALX500 bodied Dennis Trident 10.6m was sold to KCRC Bus Division in the end of 2004. One thing should be mentioned, a batch of NWFB Leyland / Volvo Olympian was on loan to KCRC Bus Division for the feeder service in the North-west New Territories.
After the commissioned of the West Rail, both Light Rail and feeder bus service cannot live up with the commuters expectation due to the underestimated of the demand and further service adjustments were implemented. In short terms, shortage of fleet can be solved by hiring buses from NWFB, however, there were still a need for introduced more buses for KCRC Bus Division especially when the Metrobus reached the end of their useful service life. As brand new buses cannot be delivered within short period of time and NWFB decided to sell surplus bus in the fleet made the Dennis Trident 10.6m immediately available to KCRC and hence, they were acquired in the end of 2004.
KCRC Bus Division already operated a fleet which consisted of 22 Dennis Trident 11.3m with modified ALX500 bodyworks from Walter Alexander since mid. of 2000. Compared with the first-hand Trident in the fleet, matt black glazing staircase panel can be found on the Trident acquired from NWFB while the 11.3m variant, aluminum sheet staircase panel was chosen. In addition, as mentioned before, modified version ALX500 bodywork was fitted on Trident 11.3m while those second-hand members were fitted with an earlier version ALX500 bodywork and this can be identified much easily when viewing from the rear.
The first batch Dennis Trident to be sold to KCRC was withdrawn from NWFB fleet since Nov., 2004 and the mobile multi-media unit was removed. Several of the batch included ex-NWFB 1601, now as KCR 701(JC6299) repainted with standard KCRC Bus Division livery before delivery. Due to lack of preparation time, some of the batch retained with the NWFB livery and some even with the commercial banner advertisement when entering service in mid. of Dec., 2004. They were first deployed on routes serving Tuen Mun like 506, K51 and K52 and later route K73 serving Tin Shui Wai when more Trident delivered from NWFB. Started from the end of Dec., 2004, 713 - 718 were deployed on the feeder service linking Tai Po Market Station which become the first super low floor bus serving the East Rail passengers. Both 720 (JC9219) and 729 (JE9381) were the first batch of KCRC bus with rear-circuit television to cater the operation need of K66 serving Tai Tong and except the Metrobus, Leyland Olympian and Mitsubishi MK, rear-circuit television were later installed on all buses in the fleet.
Further acquirement of Dennis Trident from NWFB were made in 2005 to cope with the amendment of LRT and related feeder service networks together with fleet upgrade programme. The first purchased order included 12 Dennis Trident 10.6m and they were commissioned with KCRC Bus Division in Mar., 2005 with the last two deployed on the East Rail feeder service. The last 5 Dennis Trident were delivered in Sep., 2005 along with 6 Dennis Trident 11.3m from NWFB and only 745 (JD1834) was assigned on the East Rail feeder service. As the first batch of the second-hand Dennis Trident, some of the were entered service with the standard NWFB livery.
As KCRC were merged into MTR on 2, Dec. 2007, all buses of KCRC Bus Division including the Dennis Trident were transferred to MTR Bus Division and a KCRC logo was replaced with the MTR Logo on the buses running in the North-west New Territories. When West Rail extended the Kowloon sided terminus to Hung Hom on 16 Aug., 2009, feeder service K16 operated between Hung Hom and Nam Cheong was finally withdrawn from service one month later and as number of buses was more than the operation need, all Dennis Trident 10.6m running on East Rail feeder service were transferred to West Rail section.
Starting from mid. of 2009, MTR bus introduced a new colour scheme and 743(JC5627) was the first Dennis Trident 10.6m received the new livery and to be the fourth repainted with the new livery in MTR Bus fleet. 747 (JC4903) not only the last Trident 10.6m in the fleet bus also the last to be repainted and further compartment refurbishment was carried out on the Trident to upgrade service standard and meet operation need.
MTR Bus started to dispose Dennis Trident 10.6m from NWFB since 2015 and the first to be withdrawn was 737 (JD1982) which delicensed on 5 Mar., 2015. 719 (JC8013) and 723 (JD1704) were the last two stayed with MTR Bus, they were backed to Tuen Mun depot after supporting duties in the morning rush hours on 16 Dec., 2016 and indicated the fully retirement of Dennis Trident 10.6m. The role they played on different feeder routes linking Light Rail and West Rail was replaced by Alexander Dennis Enviro500MMC and the Volvo B9TL.
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