50 units of the Alexander Dennis Enviro500 (3 Door) double-deck bus, configured with three doors and two staircases for smoother boarding and alighting, has been procured by the Land Transport Authority in April 2019, alongside 50 3-door MAN A95 (Euro 6) buses.
These buses are the first to feature a double glass-staircase design on both front and rear staircases, as visible on the right side of the bus.
Complementing the futuristic looks of the bus is a fully low-floor design on the lower-deck, making entering and exiting the bus very accessible.
These buses are the product of engineering efforts by Alexander Dennis Limited after the initial conception in 2016. The engine and drivetrain components had to be relocated to the right rear of the chassis in order for a full-low-floor design.
Registration of these buses began in September 2021, and these buses are currently with SBS Transit & SMRT Buses.
SBS Transit debut
SBS Transit launched its 3-Door Alexander Dennis Enviro500 buses on 26 October 2021, deployed on Bus Service 974.
Two buses were deployed, SG6344G & SG6347Z.
SG6347Z later was deployed on Service 974A at night, performing the 01:05 trip from Choa Chu Kang Ave 4 (Opp Choa Chu Kang Stn).
SMRT Buses debut & Breakdown
One unit (SG6349T) was deployed by SMRT Buses on Bus Service 190, with its first trip at about 1554hrs from Choa Chu Kang Int.
However, the bus broke down along Choa Chu Kang Drive towards Kampong Bahru Bus Terminal at about 1918hrs due to a fault with the middle door. The bus has since returned to service.