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Diesel multiple units

Diesel multiple units (DMUs) are regional rail cars which contain both passenger accommodations and propulsion. Diesel engines, electric generatorss and electric motors are located below the passenger compartment.

Because they are self-propelled, no large locomotive engine is required. The train "scales" well (I.e. adding additional cars automatically adds horsepower). Distribution of the propulsion among the cars also results in a system that is less vulnerable to single-point-of-failure outtages.

Because they operate on diesel, there is no need to run overhead electric lines or electrified track, which can result in lower system construction costs.

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