Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: The British Rail Class 91 is a class of 140 mph (225 km / h), 4.54MW / 6,300 hp electric locomotives ordered as a component of the East Coast Main Line modernisation and electrification programme of the late 1980s.

The British Rail Class 91 is a class of 140 mph (225 km / h), 4.54MW / 6,300 hp electric locomotives. They were ordered as part of the East Coast Main Line modernisation and electrification programme of the late 1980s.