Original: The British Rail Class 91 is a class of 140 mph ( 225 km/h ) , 4.54 MW/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 .