Transit Technology

Diesel Multiple Units (DMU) 

Sleeker looking than a locomotive hauled train, a DMU is powered by a diesel motor rather than a locomotive.
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Electric Multiple Units (EMU) 

The EMU is heavier than a light rail
vehicle, but operates in the same way. It is powered by an overhead
electrical system.
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Transit Technology Resources
Commuter Rail Analysis
Technology Fact Sheet
Updated EMU and DMU Technology Analysis - July 19, 2007
Responses to Questions from the RTD Board of Directors - July 23, 2007
Transit Technology Brochure