Yutong ZK6125BEVGS (E12DD)

Yutong ZK6125BEVGS (E12DD)
Yutong E12DD Electric Bus
Yutong E12DD Electric Bus
Manufacturer Zhengzhou Yutong Bus Co., Ltd.
Bodywork Yutong Integral
Years in operation 2020—Present
Operators Tower Transit Singapore
Go-Ahead Singapore
SMRT Buses
Length 12 metre
Motor TBC
Accessibility Low floor
Emission Standard Zero tailpipe emissions

The Yutong ZK6125BEVGS (E12DD) is a fully electric double-deck city bus manufactured by Yutong in China. The bus model shares its model name with the more prevalent Yutong E12 single-deck electric city bus.

10 units of the Yutong E12DD bus were procured by the Land Transport Authority in 2018 as part of efforts to build a more environmentally friendly public bus fleet. A further 10 more Yutong E12 single-deck electric buses would be acquired, for a total of 20 Yutong electric buses. In total, 60 electric buses were procured from three separate manufacturers at a total sum of S$50.64 million.

Bus operators in China are primary customers of the Yutong E12DD, with units operating in the Chinese cities of Guangzhou, Shangqiu, Zhengzhou and Zhoukou.


The Yutong E12DD is marketed as an electric city bus capable of being fitted as a sightseeing bus, with a large upper deck windshield, large side windows and a panoramic sunroof, along with a suite of configurable interiors features for passenger comfort.

The bus design incorporates large-capacity batteries which allow the bus to travel more than 200 km on a single charge, under urban road conditions. Yutong touts cost savings of over 30% over a 5-year period as compared to an equivalent diesel-powered double-deck bus. Constant-power charging is said to reduce charging times by 25%; allowing for a charging period of just 1.9 hours at night. However, the actual battery capacity of the Singapore units is to be confirmed.

Yutong ReCtrl Electric Drive

Yutong's Electric Drive Technology (Click to expand)

Yutong’s electric drive technology platform is called ReCtrl (or 睿控). In its most iteration, ReCtrl 4.0 (first released in 2017) combines four electric control technologies and four smart technologies as such:

  • Electric drivetrain
    — highly efficient electric motor replaces the traditional automatic transmission
  • Regenerative braking
    — motor acts as a generator during braking, recovering kinetic energy into electrical energy to be stored in the batteries
  • Electric steering
    — electro-hydraulic power steering requiring least steering effort
  • Electric air-conditioning
    — automatically-adjusted heating/cooling with independent zone control, offering at least 15% energy savings over traditional vehicle air-conditioners
  • Intelligent vehicle energy management system
    — overall management of energy consumption through onboard electronic control units and CAN bus network
  • Intelligent climate control
    — air-conditioning compressor reacts automatically to deliver optimum cooling capacity
  • Intelligent telematics
    — key vehicle operating parameters are transmitted over the internet for health and status monitoring
  • Intelligent charging
    — vehicle charging performance is recorded for monitoring


The Yutong E12DD is a fully electric city bus manufactured by the Chinese company Zhengzhou Yutong Bus Co., Ltd (郑州宇通客车股份有限公司), which manufactures road vehicles (primarily buses). The E12DD is just one of Yutong’s electric bus products, alongside hybrid and regular diesel buses.

Photos of the Yutong E12DD were first circulated online in late August 2019, where the bus was spotted at a test centre in China.

The exterior bodywork styling appears to be modified off the original E12DD, but fitted with a different head and rear design that possibly takes inspiration from the Yutong City Master, and a front bumper/headlight design taken from the Yutong U12. The Yutong E12DD is offered at a length of 12.3 metres as standard, but shortened to 12 metres for the Singapore market.

The bus body is constructed out of high-strength steel. Features offered include IP68-rated electronics, electronically-controlled air suspension, dual-circuit air brakes with ABS among others, which are common to most modern buses. It is noted that a significant portion of space on the lower deck is occupied by batteries, hence the reduced passenger cabin space.

The buses were spotted in Singapore in February 2020.

Yutong E12DD buses are assigned the registration numbers SG7000S – SG7009T. All units were registered between 4 June 2020 – 20 July 2020, with SMRT Buses, Tower Transit Singapore and Go-Ahead Singapore receiving these buses.

Basic Technical Specifications
Electric Motor Yutong permanent magnet synchronous electric motor;
Nominal power/torque of 215 kW / TBC Nm
Maximum power/torque of 350 kW / 3200 Nm
Battery Lithium iron phosphate battery (Capacity TBC)
Charged via CCS Type 2 (providing DC charge)
Bodywork Yutong integral bodywork (Steel monocoque structure). Built in Zhengzhou, China.
Full low-floor configuration
EDS LECIP Electronic Display Sign
Orange LED Matrix; Mounted on Front, Left side and Rear
PIDS LECIP OBC-VISION Passenger Information Display System
LED text displays, LCD display screens, interior speakers & exterior speaker
Driver Assistance TNT Surveillance T-Guard
– Forward collision warning system (T-FA Front Alert Camera)
– Side collision warning system (T-SA Side Alert Cameras)
Anti-Fatigue system (T-DA Driver Alert Camera)
– T-SEEDS telematics system
Passenger Capacity Seating (Upper deck): TBC | Seating (Lower deck): TBC | Standing: TBC
Not including 2 foldable seats, 2 wheelchair bays
Additional Specifications SMC Transit door systems
Ster New City
Cling EZHS-08 electric rear-mounted air-conditioning
TNT Surveillance T-APC automatic passenger counting system
ACTIA Podium 2 Dashboard
Rear axle steering
USB Charging Ports
Stroller restraint system
Interior mood lighting

The steel monocoque structure and the weight of batteries contribute to the heavy unladen weight of the Yutong E12DD, at around 17.1 tonnes. For comparison, both the MAN A95 and Volvo B9TL each weigh around 15 tonnes unladen.

The Yutong E12DD also shares many similar subsystems with the Yutong E12 single-deck electric buses. such as electronic display signs and passenger information displays from LECIP, and driver assistance/management systems from TNT Surveillance (collision warning, anti-fatigue and telematics systems).

Finally, the Yutong E12DD is the first production batch of buses to be fitted with a rear axle steering system, or RAS (likely supplied by ZF).  The trailing axle pivots in the opposite direction to the bus’ steering direction, which improves the turning radius and reduces wear on rear tyres. This feature was only previously featured on the 12.8-metre long MAN A95 – Lion’s City DD (3-Door) Concept Bus.

NARI Bus Charger (Photo: Public Transport Council FB Page)


The 10 Yutong E12DD buses are registered as SG7000S – SG7009T.

These buses, registered as YUTONG ELECTRIC ZK6125BEVGS AUTO, are leased to the following operators:

Charging Infrastructure

For the overnight charging of the Yutong E12 buses, overnight chargers have been installed at Bulim Bus Depot and Loyang Bus Depot, supplied by NARI.


See Also:
External Links & References:

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34 thoughts on “Yutong ZK6125BEVGS (E12DD)

  • 9 June 2020 at 10:46 AM

    Similar to the Yutong E12, for the Yutong E12DD electric buses under SMRT, they will park at Bulim Bus Depot.

    • 14 July 2020 at 5:10 PM

      Confirmed KJDEP although they will go to BUDEP to charge

  • 5 June 2020 at 3:20 PM

    So the balance 1 (SG7009) i assume TTS will lease it since a few of their SBS Citaros already have operator logo removed

  • 4 June 2020 at 7:20 PM

    GAS might lease 3 DDs and TTS probably will lease the balance 3..Some of their SBS Plate Citaros already have their operator logo removed.


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