Alexander Dennis Enviro500 (Batch 2)

Alexander Dennis Enviro500 (Batch 2)
SMRT Alexander Dennis Enviro500 (Batch 2)
SMRT ADL Enviro500 (Batch 2)
Manufacturer Alexander Dennis Limited (ADL)
Bodywork Enviro500 MMC
Years in Operation 2017–
Operators SMRT Buses
Tower Transit
Technical Data
Length 12 metre
Engine Cummins ISL8.9E5 340B
Transmission ZF EcoLife 6 AP 1700 B
Accessibility Low Floor & Wheelchair-accessible
Emission Standard Euro V (SCR)
Main Article: Alexander Dennis Enviro500

The Enviro500 is a low-floor, three-axle double-deck transit bus built by Alexander Dennis Limited (ADL), and part of the Enviro range of buses. First produced in 2002, they are hugely successful in the Hong Kong market, with other units operating in Europe, North America and Australia.

SMRT Buses was initially the sole operator of the Enviro500 in Singapore, with an initial order of 201 Enviro500 MMC buses in 2014. With the gradual implementation of the Bus Contracting Model (BCM), Enviro500 buses owned by the Government were also operated by Tower Transit, who was awarded the Bulim Bus Package & Sembawang-Yishun Bus Package.

This article concerns the second batch of 15 buses which were procured as part of the Bus Contracting Model (BCM) and entered service in August 2017 with SMRT Buses. These buses bear largely similar specifications as compared to the initial 201 buses and come equipped with USB Charging Ports.

More background information can be found on the main Alexander Dennis Enviro500 article.


The Enviro500 is part of the Enviro series of Dennis low-floor buses which was launched in 2002. Click here for the full bus model history.

In 2012,¬†Alexander Dennis revealed the third-generation Enviro500 aimed at the Hong Kong market. Named the Enviro500 MMC (for¬†Major Model Change), it boasts a new exterior styling adapted from the Enviro400, along with¬†an all-new interior. The new chassis features improved maintainability, reliability and¬†reduced operating costs.¬†New design features included offsetting the¬†longitudinally-mounted engine and gearbox, along with a safer straight staircase and fuel tank underneath the stairs, a design feature adapted from the Enviro400. The chassis was¬†was offered in 11.3m, 12.0m and 12.8m lengths. A rear-axle steering system is also made available, supplied by ZF (Servocom¬ģ RAS).

The Enviro500 MMC is also known as the Enviro500NG (for New Generation), Trident E500 Turbo, or simply E50D (with ‘D’ indicating diesel) or E50H (with ‘H’ for hybrid). The Hybrid variant was made available in 2013, incorporating a series hybrid drive-train by BAE Systems (HybriDrive series-E), achieving the Euro VI emission standard.

Production Batch 2¬†‚ÄĒ ADL¬†Enviro500¬†MMC ‚ÄĒ SG5700T – SG5714D

In late 2016, the Land Transport Authority (LTA) placed orders for fifteen (15) ADL Enviro500 MMC buses under the Bus Contracting Model (BCM). These buses are the second production batch of ADL Enviro500 buses procured (after the initial batch of 201 buses), and equipped with USB charging ports.

All 15 units were registered from SG5700T to SG5714D on 10 August 2017 and allocated to SMRT Buses.

In September / October 2021, several buses were transferred to Tower Transit as part of the Sembawang-Yishun Bus Package.


Basic Technical Specifications
Engine Cummins ISL8.9E5 340B engine
Inline 6-cylinder turbocharged, 8849cc
Power/Torque rating of 340 hp (250 kW) @ 2100 rpm / 1500 Nm @ 1200 – 1400 rpm
Emission Standard Euro V compliant
Selective Catalytic Reduction (SCR) technology requiring diesel exhaust fluids such as AdBlue, and achieving the Euro V emission standard.
Transmission ZF EcoLife 6AP 1700B gearbox, six-speed automatic
with TopoDyn Life control software system
Bodywork Enviro500 MMC Bodywork
Chassis produced by Terberg Tractors Malaysia in Pasir Gudang. Assembled in Zhuhai, China, and shipped completely-built-up (CBU) to Singapore.
EDS Mobitec MobiLED Electronic Display Signage (EDS)
Connected to a Mobitec MobiMASTER ICU 602 controller
Doors Ventura System doors
Double-leaf entrance, sliding plug exit.
Capacity Licensed capacity of 134 passengers:
55 upper deck seating, 28 lower deck seating and 51 standing with one wheelchair bay.
Foldable seat for one person integrated with wheelchair backrest

The second batch of Enviro500 buses feature the same technical specifications as the initial 201 buses delivered in 2014. Although ADL had launched a Facelifted Enviro500 MMC in late 2015, the newer bodywork design was not opted for. These batch of buses were part of 137 new USB charging port-equipped buses procured by the LTA in late 2016, the remainder being 122 Facelifted MAN A95 buses.

On the exterior, these buses are virtually identical to the first batch of buses, except for slightly tinted passenger windows. On the interior, these buses come equipped with USB Charging Ports, tinted passenger windows, and many more emergency hammers as compared to the first batch of buses. In addition to hammers on the pillars in-between windows, they are now placed near the front and rear glass windows of the upper deck, and beside the first-aid kit and fire extinguisher to aid with breaking the glass panel.

The first of these buses made their revenue service debut on 14 August 2017, with SG5703K deployed on SMRT Bus Service 964.

Main Article: New batch of Enviro500 buses delivered


Lower Deck

The lower deck of the bus features 28 permanent¬†seats. Being a low-floor bus, the bus offers step-free access from entry/exit doors until the last row of seats. A staircase behind the driver’s cab connects the lower and upper decks.

Like most double-deck buses in Singapore, the Alexander Dennis Enviro500 (Batch 2) buses are configured with two doors: an entrance door at the front, and an exit door in the middle. The entrance doors are conventional inward-swinging leaf doors, while the exit doors are outward-swinging sliding plug doors. They are supplied by Ventura Systems and are pneumatically operated.

Opposite the staircase, there are three side-facing priority seats, reserved for elderly and handicapped passengers, and passengers travelling with young children. They are indicated in red seat covers and also offer USB Charging ports, an improvement over the MAN A95 buses which do not have USB Charging ports near the priority seats.

The wheelchair bay behind the staircase and opposite the exit door accommodates one passenger-in-wheelchair (PIW) and is also equipped with a USB Charging port. The backrest also doubles up as a single foldable seat when not in use. Two seatbelts are also installed as part of a restraint system for wheelchairs or prams; a separate stroller restraint system was trialled months prior to the launch of these buses.

Grab poles and hand grips are located on both sides of the aisle. All seats also have hand grips to provide commuters with additional support.

Bus stopping bell-pushes are located around the bus cabin, either mounted to stanchion poles or on the pillars in-between windows. Emergency hammers are also located on these pillars.

The seating layout at the rear is similar to the MAN A95, with facing seats in-between wheel arches and more facing seats at the last row, which seats 5 passengers. Like the initial batch of ADL Enviro500 buses, headrests are not provided for the last row of seats.

Upper Deck

The upper deck of the bus is laid out in a conventional four-abreast seating, and a central aisle running the length of the bus.

There are 55 seats on the upper deck. Grab poles run the length of the aisle for commuters moving around the bus. All seats also have hand grips to provide commuters with additional support.

Bus stopping bell-pushes are located around the bus cabin, either mounted to stanchion poles or on the pillars in-between windows. Emergency hammers are also located on these pillars.

At the front window, the bus registration plate is now mounted above the LED text display. The previous batch of ADL Enviro500 buses had them mounted below the text display.


The staircase allows for passenger movement between the lower and upper decks of the bus. A seat counter (LED number display) on the lower deck displays the number of available seats on the upper deck.

The staircase is designed with two flat staircase landings (‚Äústraight staircase‚ÄĚ), a feature common in newer buses by eliminating cornered steps.

Driver’s Compartment

The turquoise display unit on the bottom left is the New On-board Bus Equipment (NOBE) fare collection system. Just above that is the Trapeze Common Fleet Management System (CFMS) display unit. Door controls and the handbrake lever are located on the right of the driver.

Additional Features

USB Charging Ports

The bus is equipped with USB charging ports for all seats, with the exception of the middle seats at the rear of the bus (both lower and upper decks). A single charging port has room for two USB cables. For the first time in Production Batch buses, USB Charging Ports were offered at the priority seats and wheelchair bay.

Passenger Information System (PIS)

As these buses were built to SMRT specifications, they feature an LED Text Display which displays the next bus stop, and shows ‚ÄėBus Stopping‚Äô when the bell is pressed. They are mounted at the front of the upper and lower deck.

Gallery (Interior):
Gallery (Exterior):


In April 2017, prior to the registration of these buses, the freshly delivered ADL Enviro500 (Batch 2) buses were sighted in a holding area along Tuas West Road, in a Lush Green base coat. Further interior furnishings were installed and the SG<3Bus and operator logos were affixed prior to registration and entry into revenue service.

More pictures at the New batch of Enviro500 buses delivered article.

List of Buses:
  • SG5700T
  • SG5701R
  • SG5702M
  • SG5703K
  • SG5704H
  • SG5705E
  • SG5706C
  • SG5707A
  • SG5708Y
  • SG5709U
  • SG5710P
  • SG5711L
  • SG5712J
  • SG5713G
  • SG5714D
See Also:
External Links & References:

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