SMRT Mercedes-Benz Citaro; First 100% Low-Floor Bus in Southeast Asia
March 9th, 2010Site Admin of Minibus Group, an Administrator of BusInfoHub, several bus enthusiasts and members of Friends of SMRT (FOSMRT) are invited to the launch of Southeast Asia’s first 100% low-floor Mercedes-Benz Citaro (O530) at SMRT Ang Mo Kio Depot on 9th March 2010. This historical moment marks the progress into a new era in Singapore bus industry, a full low floor, accessibility-friendly and *no internal steps bus.
Some quick facts of this bus:
1 driver, 39 passengers (including fold-up seat for two passengers) and 44 standing passengers.
Full low-floor along the corridor of the bus. One step to access rear section seats.
Fully built bodywork by EvoBus AG in Germany. Basically a one-through manufacture.
Large Gorba front display to enable passengers to spot the service number and route details.
Press Release:
SMRT: http://www.smrt.com.sg/Upload/201031010315179993.pdf
Articles written by enthusiasts on the launch:
BusInfoHub (affiliated): http://businfohub.com/cms/articles/specialfeature/smrtcitarolaunch
Photos taken during the event.

Mr Thomas Bauer, Senior Manager, Bus & Coach, Daimler SEA

Mr Michael Gopfarth, Executive Managing Director, Daimler Bus (Germany)

Mr Wolfgang Huppenbauer, CEO, Daimler SEA

Ms Saw Phaik Hwa, President and CEO, SMRT Corporation

Handover of Citaro model (scale 1:32) to Ms Saw.

Round of applause as the bus is driven in.

Demonstrating its wheelchair-friendly feature.

Executives from Daimler and SMRT impressed by the bus’ features.

Interior without stairs; guests move quickly towards the rear, demonstrating what the bus is designed to do.

Showcasing its full 11.9-meter length.

Two buses, decades apart. The step-bus Nissan Diesel U31 RCN (JDM: K-U31) and the Mercedes-Benz Citaro (O530).
I am very grateful to FOSMRT liason officer, Vivian, for finding two staff from Daimler Group SEA who could answer my technical questions. Excerpts.
Q: Why is the OM 906 hLA used on the Citaro instead of the OM 457 hLA that present OC500LE buses are using?
A: Citaro buses come with the smaller 906 as it is suited for the bus. The 457 is designed for sub-urban usage and has a larger power, while the 906 is sufficient for city usage.
Q: Fuel consumption wise, would it be lower and more effective than the 457?
A: This has to depend on many conditions. Different routes, different drivers will affect fuel consumption. At this point there cannot be a specific figure other than benchmark ones.
Q: In achieving this full low-floor design, the engine has to be shifted to the side. Does this mean more sophistication?
A: Yes, a total new design of the engine mounted on the left is what makes it able to achieve a full low-floor specification.
Q: What is special about the radiator system?
A: The radiator for the Citaro uses a hydraulic driven fan. The radiator is mounted on the outer frame, the intercooler on the inner frame. The fan is driven using hydraulic oil. This is different from magnetic driven ones on the OC500LE.
Q: The OM 906 hLA have more horsepower-per-liter compared to the 457. How different would this be in performance?
A: The 906 would be efficient and depending on its mixture method and its efficiency, it would be as effective as the 457.
Q: In the hot and humid climate of Singapore, does the cooling efficiency of the vehicle need special or larger cooling capacity?
A: The Citaro is sold worldwide. They even operate in Dubai, where its a desert climate. One size fits all.
Q: Gearbox of the vehicle?
A: ZF 6HP592C.
Q: Why not the Ecolife drive-line?
A: The Ecolife is suitable for countries with more terrain, and is fitted with the TopoDyn software system. in Singapore, a conventional drive-line is sufficient.
Q: Air conditioning unit?
A: Konvekta.
Q: Does IFS (Independent Front Suspension) make it a more comfortable ride for this bus?
A: You would have to ride it to find out. Basically it is better than a conventional suspension.
Q: Fuel capacity?
A: About 200 liters.
Regarding the secret of full low-floor…
Longitudinal, side mounted horizontal diesel engine.
Scania, Checkmate.
*No internal steps mean no step(s) along the corridor of the bus.













































