You will be given a definition of a task first, then some input of the task.
In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

On the UK rail network , multiple working is where two or more traction units ( locomotives , diesel multiple-units or electric multiple-units ) are coupled together in such a way that they are all under the control of one driver ( multiple-unit train control ) .
Output:
Multiple Working is the term used in the UK where more than one operational diesel or electric locomotives are coupled together under the control of one driver .