Original: 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.
Simplified: The British Rail Class 91 is a class of 140 mph, 6,300 hp electric locomotives ordered specifically for the East Coast Main Line modernisation and electrification programme of the late 1980s.