Definition & Meaning of "diesel multiple unit"in English

What is a "diesel multiple unit"?

A diesel multiple unit (DMU) is a type of train that is powered by diesel engines and consists of several connected carriages, each with its own engine. Unlike traditional trains, which require a separate locomotive, each carriage in a DMU can move independently, allowing for more flexibility and quicker acceleration. DMUs are often used on regional or local passenger services, especially on tracks where electric trains cannot operate. They are popular in areas with less frequent rail service or where it is not practical to build electric rail infrastructure, providing a reliable and efficient way to transport passengers over medium distances.