Given the task definition and input, reply with output. 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.

Docklands Light Railway rolling stock is the passenger trains and service vehicles ( collectively known as ' rolling stock ' ) used on the Docklands Light Railway ( DLR ) , which serves the London Docklands area in the east of London .
Docklands Light Railway rolling stock means the passenger trains and service vehicles used on the Docklands Light Railway ( DLR ) in London , England .