Alexander Dennis Enviro500 Mock-up Bus

An Alexander Dennis Enviro500 Mock-up Bus, decorated in Lush Green, made its debut appearance at the Land Transport Authority (LTA)’s Our Bus Journey Carnival at Ngee Ann City. The bus is one of two concept buses commissioned by LTA to provide the public with a glimpse of how buses would look like in the future, the other being a MAN Lion’s City DD L.

The concept bus features three doors and two staircases, with new features such as seats with headrests, USB charging ports, stylish interior lighting and provisions for a Passenger Information Display that will give real-time information on the next bus-stop along its route (not featured).

Alexander Dennis Enviro500 Concept Bus Mock-up - Front view
Alexander Dennis Enviro500 Concept Bus Mock-up – Front view


Contract PT236 was awarded to Alexander Dennis (Asia Pacific) Ltd for S$498,500.00 on 8 Oct 2015, and also jointly to Singapore Technologies Kinetics Ltd for S$610,000.00, beating Cycle & Carriage, MCV, Yutong and Volvo. The Alexander Dennis Enviro500 Mock-up Bus was the final product of this undertaking.

The bus is a 13.0-metre long Alexander Dennis Limited (ADL) Enviro500 MMC, with the exterior based on a 2015 facelift. Available in the market in 12.0-metre and 12.8-metre lengths, the mock-up was built on an extended version of the original chassis to accommodate a rear staircase and door over its rear overhang. Lower deck seating was sacrificed to make way for the rear staircase, which leads to a third door at the rear of the bus. The front of the bus bears largely similar interior characteristics to other ADL Enviro500 MMC buses in Singapore and abroad.

A three-door double-deck bus is not new to ADL; it had been done before, but ADL decided that the concept was not worth pursuing and the bus never entered production. The return to three-door double-deck buses is likely solely for LTA demonstration purposes. Owing to technical limitations (or lack of contractual obligation), an engine was not installed on the mock-up. The bus was powered by an external electricity source for the duration of the carnival.

The chassis was built at ADL’s chassis assembly plant at Pasir Gudang, with exterior panels, interior panels and other fittings from ADL’s production facilities in the United Kingdom. Assembly of this bus was performed at Soon Chow, a local bus bodybuilding company.

Interior (Lower Deck):

The lower deck features a standard ADL layout with 20 seats. A single wheelchair bay behind the front staircase can also function as a foldable seat.

Alexander Dennis Enviro500 Concept Bus Mock-up - Lower deck seating
Alexander Dennis Enviro500 Concept Bus Mock-up – Lower deck seating

All seats on the bus were fitted with thick upholstery for ride comfort. For wheelchair accessibility, this bus offered a manual wheelchair ramp and offside wheelchair bay, with a foldable seat integrated within the wheelchair backrest, a specification already featured on ADL E500 buses on the roads. USB charging ports are also provided at all seats.

Interior (Upper Deck):

The upper deck features 52 upper deck seats and two staircases. Similar to SMRT specifications, this bus does not feature adjustable air-conditioning outlets.

Alexander Dennis Enviro500 Concept Bus Mock-up - Upper deck seating (Front to Rear)
Alexander Dennis Enviro500 Concept Bus Mock-up – Upper deck seating (Front to Rear)

A second staircase at the rear of the upper deck leads to the lower deck and an exit door at the rear of the bus.

After the Carnival

Together with the STC Vintage Bus, the Alexander Dennis Enviro500 mockup bus was been moved to Land Transport Authority’s headquarters at Hampshire Road after the carnival. The bus could be seen from Bukit Timah Road, separated from the road by a fence.

Alexander Dennis Enviro500 Mockup Bus at LTA Headquarters, Hampshire Road
Alexander Dennis Enviro500 Mockup Bus at LTA Headquarters, Hampshire Road

The bus was showcased at the LTA Walk-Cycle-Ride Symposium in July 2016, along with the MAN Lion City DD L. It also made an appearance at the Singapore International Transport Congress and Exhibition (SITCE) in October 2016, held at Suntec City.

Lack of engine

Unlike the MAN Lion’s City DD L Concept Bus, which was fitted with an engine and later entered revenue service trials, the Alexander Dennis Enviro500 Mockup Bus was not intended to be fitted with an engine. The current Enviro500 chassis layout would not leave enough room for the second staircase at the rear of the bus. Re-engineering the bus for a longitudinally-mounted engine, while possible, would be unlikely for a small market such as Singapore owing to economies of scale unless the LTA commits to future bulk orders of the Alexander Dennis Enviro500 product and its derivatives.

Furthermore, in its current form, the vehicle’s long rear overhand could result in sideswipe incidents and ground impacts. If the LTA chooses to pursue this design of having the rear door at the end of the bus, further modification work would likely be required to reduce the rear overhang.

Air-con installation

Main article: ADL Enviro500 3-Door Concept Bus – 2018 update

The ADL Enviro500 3-Door Concept Bus was later installed with a new air-conditioning system for permanent display at LTA’s Bedok Campus, with minor amendments to the bus cabin.

Concept Bus to Reality

Artist's Impression for ADL 3-Door Double Decker Bus (Photo: LTA)
Concept Rendering for ADL 3-Door Double Decker Bus (Photo: LTA)

Under Contract PT342 – Procurement of 3-Door Euro 6 Double Deck Diesel Buses awarded on 25 April 2019, ADL was awarded a contract for fifty units of the Alexander Dennis Enviro500 (3 Door) Bus, with deliveries expected in 2020. The remaining fifty buses would be fulfilled by ST Engineering Land Systems.

These 50 new Alexander Dennis Enviro500 (3 Door) Buses would join the existing operational fleet of 216 Alexander Dennis Enviro500 public buses in Singapore, procured in 2 batches. They will also be the first Euro 6 Enviro500 buses in Singapore.

QBus Model

In May 2019, 易搭製作 Easy Access Productions launched the limited edition “ADL Enviro500 3-Door Concept Bus” QBus Model.

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7 thoughts on “Alexander Dennis Enviro500 Mock-up Bus

  • 1 March 2021 at 10:30 PM

    Bus @ Ulu Pandan Depot


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