Meter-gauge diesel electric multiple unit (DEMU)
Inquire NowDescription
The meter-gauge diesel electric multiple unit (DEMU) is an advanced and robust train designed specifically for the Ghana Railway in Africa. This state-of-the-art EMU features a six-car formation consisting of two motor cars and four trailer cars, strategically arranged with motor cars at each end. Powered by diesel generators, the train operates on an innovative AC-DC-AC electric drive system, ensuring efficient performance and reliability. With an impressive overall length of approximately 108.4 meters and a width of 2,650 mm, this model adopts a meter-gauge system of 1,067 mm.
Each motor car is meticulously designed with a driver’s cab, control room, power room, cooling room, and passenger saloon. Constructed with a carbon steel body, the DEMU is equipped with sophisticated technology such as elastic axle hung traction motors, solid wheels, and hollow shaft drive gear boxes. Notably, the traction motors and gear boxes are supplied by VOITH, while CAT diesel engines power the unit, complemented by traction converters from KIEPE. The transmission mode employs a “one for two” system, with auxiliary converters serving as power units for added efficiency.
This DEMU is not just an engineering marvel but also emphasizes passenger comfort, offering semi-cushioned seating, movable windows, and automatic sliding-plug doors in its trailer cars. The diesel AC-DC-AC electric drive mode is cutting edge, utilized by only about 3% of EMUs worldwide, highlighting its advanced capabilities.
Key techniques implemented in the DEMU include microcomputer control, performance matching for the traction power system, anticorrosion techniques for high humidity environments, and specialized coatings for durability.
Specifications
| Attribute | Details |
|---|---|
| Gross weight of EMU (all seats taken) | 254t |
| Gross weight of motor cars (all seats taken) | ≤48t |
| Gross weight of trailer cars (all seats taken) | ≤39.5t |
| Overall length of EMU | Approx. 108.4 m |
| Width of car body (widest point) | 2650mm |
| Height of floor above rail level (empty car) | 1130mm |
| Drive mode | AC electric drive |
| Type of running gear | Bogie type |
| Motor car | TWD161 |
| Trailer car | TWT162 |
| Wheel diameter | (New wheel/fully abraded) φ700mm /640mm |
| Axle arrangement of motor car | B0-B0 |
| Axle load | <14t |
| Maximum running speed | 80km/h |
| Maximum test speed | 90km/h |
| Installed power/speed of EMU | 1236kW(618 kW x2)/1800rpm |
| Starting tractive effort (half-worn wheels) | Approx. 145KN |
| Starting acceleration of EMU (straight and level track) | 2.0 km/h/s (0.55m/s2) |
| Deceleration (normal braking & emergency braking) | 3.0-4.0km/h/s (0.83~1.11 m/s2) |
| Seating capacity of EMU | 668 persons |
| Fuel tank capacity | Approx. 750L |
| Emergency braking distance | ≤400 m (initial speed at brake application on straight and level track is 80km/h) |
| Overall coefficient of heat transfer of car body (K value) in stationary state | ≤1.2W/m2.K |
| Riding index | ≤2.5 |
| Wheel unloading rate | ΔP/P≤0.65 |
| Derailment coefficient | Q/P≤1.2 |
Additional Information
The DEMU is engineered with advanced features that enhance both performance and comfort, making it suitable for various operating conditions. Its design ensures adaptability to high humidity and high salinity environments, significantly extending its service life and reliability.
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