Mechanics
Each railcar features an underfloor mounted Mercedes 475 hp V12 twin turbo direct injection diesel engine, operating at a constant 1500 RPM, which is directly coupled to a Reliance 400kVA alternator. Drive is provided by two Stromberg traction motors, rated at a continuous 130 kW each, mounted on a single bogie. The railcars also feature an auxiliary transformer providing 3 phase 50 Hz at 415 V which supplies air-conditioning and other ancillary power needs.
The mechanicals are all located beneath the carbody, except for radiators which are located on the roof. When the engine is switched off, interior lighting is disabled. The engine is started in the cab by battery power.
The 3000 class are less prone to emitting a black plume of smoke when accelerating compared to previous designs of DMUs running on Adelaide's metropolitan network such as the 2000 class railcars.
3000 class bogies are built by Comeng and feature airbag secondary suspension. All 3000 class railcars are fitted with electro-magnetic track brakes, which are comparatively rare on trains, though they are commonly found on trams. They are operated separately from the normal mechanical and dynamic braking.
Trains are equipped with fully automatic "Scharfenburg" couplers. Buttons for coupling and releasing these devices are located in the driver's cabs. Coupling is sometimes done at Adelaide station, requiring an extra staff member to flag the driver as well as to connect the safety chains. This feature adds to the versatility that allows anything from single (3000) unit operation to multiple unit operation of up to six cars. Many other suburban trains do not offer such flexibility.
Headlights are mounted at the top of the car, two lights in the centre. There are no marker lights at the front; however, there are red marker lights for the rear located on the upper corners.
There are metal steps up the side of the car to each door, but they are not used by passengers. Only by drivers in the railcar depots. They are illuminated by lights at night.
Read more about this topic: 3000 Class Railcar
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