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 program of the late 1980s . The British Rail Class 91 is a class of 140 mph ( 225 km\/h ) , 6300 H electric locomotives ordered as a component of the East Coast Main Line modernisation and electrification program of the late 1980s .