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Why is TTA using DMUs and not a light rail vehicle? What is the difference?

April 26, 2017DMU light rail Raleigh taxes TTA vehicle wake county

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Why is TTA using DMUs and not a light rail vehicle? What is the difference?

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A light rail vehicle is powered by motors that get electricity through overhead wires, called the catenary. DMUs are powered by diesel motors, which make them independent from the catenary. DMUs are not susceptible to power outages and the construction costs for a DMU system are significantly less since the costs of the catenary and the necessary sub-stations are substantial.