When British Rail gave the go ahead to Electrify the full length of the East Coast Main Line from London Kings Cross to Edinburgh and Leeds it was obvious that new trains would need to be built to operate fast and regular services, these in turn would replace the High Speed Train Diesel units that had been running up and down on services since the late 1970’s.
The original intention was that trains would be timed to operate up to a maximum of 140 mph (225 Kmh) although in practice they have been restricted to the same speed as the trains they replaced (the Inter City 125) due to a number of infrastructure constraints.
See the full story at...
http://www.rail.co.uk/locomotives-and-engines/electric-engines/british-rail-class-91
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