亞歷山大丹尼士Enviro400 Alexander Dennis Enviro400
編號 Class：7000 - 7059
首兩架供香港巴士公司試用的Enviro400樣板車於二零零九年十一月二十二日抵港，當中屬於城巴的Enviro400於二零零九年十二月八日由城巴接收，並於隨後二十二日安排驗車。城巴的Enviro400新車對比九巴的一架，外觀上有著些少差異，主要是車頭仍然保留樹擋，電子牌箱雖然同是由Hanover供應，但卻是城巴標準的橙色LED牌箱，空調系統則是日本電裝出品。動力來源是康明斯ISLe引擎，配以ZF "Ecolife"波箱，透過SCR (Selective Catalytic Reduction)技術，令廢氣排放達至歐五標準。另外，車廂照明全數採用LED照明系統，而7000更是首架城巴下層逃生出口採用全新的全玻璃太平門。
Brand-new 2-axle double decker appeared in Hong Kong again with a pair of Alexander Dennis Enviro400, the third member of the Enviro series in Hong Kong, was delivered in late 2009. They were also the 2-axle air-con. bus after the Leyland Victory MK2, Dennis Jubilant and the Leyland Olympian 2-axle coach in the 1980s.
Bus operators decided to purchase 3-axle double-decker since early 1980s as they can increase the capacity of buses to meet the demand. Unless for some specific operation conditions (e.g. the Metrobus of KMB for the Route TWISK) or the second hand buses introduced from UK, all new buses are 3-axle designed especially after the development of air-con double-decker to carry the extra load of the air conditioning unit. In 2008, as the change in the operation environment, bus operators started looking for the way to reduce operation cost. The introduction of 2-axle air-con double-decker was one of the solution and this was implemented in 2009 with the introduction of the Enviro400. Unlike the Enviro400 operated in UK, the Enviro400 supplied to Hong Kong got some modified to suit the operation environment in Hong Kong and was 0.3 meter longer for accommodation of the air-conditioning unit supplied by Nippon-Denso. The Enviro400 not only the first 2-axle super low floor double-decker but also the second Euro 5 standard double decker in Hong Kong.
The first two Enviro400 demonstrators were delivered to Hong Kong on 22, Nov., 2009 and the one for City Bus was arranged to receive the type approval test after one month of the delivery. Compared with the KMB demonstrator, the tree guard at the top front still retain on this Enviro400 and an orange coloured LED display from Hanover was fitted. This Enviro400 demonstrator was powered by a Cummins ISLe engine with a "Ecolife" gearbox from ZF, with the help of the Selective Catalytic Reduction technology to achieve Euro 5 emission standard. LED lighting was fitted inside the compartment and the safety door at the lower saloon was made of a single piece of toughened glass glass.
This City Bus first Enviro400 was registered on 1, Feb., 2010 as PC6795 with fleet number 7000. 41 upper seatings and 23 lower seatings with 24 standees was offered. 7000 was started to serve 117, running between Happy Valley and Sham Shui Po on 8, Feb., 2010. It was arranged to serve 260 running between Central and Stanley since 22 Mar., 2010. City Bus received another Enviro400 demonstrators on 14, Jun., 2010 with some further modification after all essential testing of the first one was completed. The second City Bus Enviro400 was registered on 2, Jul., 2010 and started to serve passengers since 22, Jul., 2010.
The good and reliable performance resulted in a further order of 38 Enviro400 was made in Nov., 2010 to tie in with the withdrawal of Leyland Olympian and the first batch Dennis Baby Dragon. The production Envrio400 chassis was completed in UK and send to Zhuhai Guangtong Automobile Company Ltd. for bodyworks assembly instead of the Wuzhoulong in Shenzhen which assembled the City Bus Enviro500 before. Unlike the prototype, the production units of Enviro400 choose traditional door as the emergency exit. Lazzerni Pratico seats used on Enviro200 was also chosen in the production Enviro400. With the revised compartment design, the total capacity of production Enviro400 is increased from 88 to 90 as a result of 6 extra seatings on the upper deck but with the reduction of 2 standees. To go one step further, Enviro400 was the first installed with a vertical LCD monitor at the lower saloon to provide route information and as a next stop announcement system.
The first production Enviro400 was arrived Hong Kong in the early of Aug., 2011, they were entered service on different routes like 6, 6X, 72, 72A, 75, 260 and 629 since the end of Aug., 2011 after all the testing and process for registration completed. Further delivery of Enviro400 was made in early 2013 after City Bus placed an additional order for 20 in 2012, first two of the batch were commissioned in Feb., 2013 and started to replace all Dennis Dragon purchased in 1996 and 1997.
Since early 2019, the original Alcoa wheels on the Enviro400 was gradually replaced with the traditional one, further reduction of standees was resulted and total carrying capacity was changed from 90 to 88 while for the demonstrators, the new carrying capacity was 85. At present, City Bus mainly deployed the pair of demonstrators on route 98 running between Lei Tung Estate and Aberdeen while the remaining actively serving the Stanley and Southern District routes. It should be mentioned that a batch of Enviro400 was on loan to NWFB for supporting route 9 and 14 during weekends when the Peak Tram system closed for the Peak Tram Upgrade Project.
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