Commuters can look forward to travelling on one of these new trains into Paddington in the future.
Hitachi has unveiled one of the new Intercity Express trains being manufactured to operate on the Great Western Main Line yesterday.
Passengers can expect faster and more reliable journeys with more seats but will have to wait more than two years before they can step on board.
Hitachi is currently manufacturing three pre-series trains in Japan but most will be built at a new rail vehicle manufacturing facility currently being constructed in County Durham.
Rail minister Claire Perry said: "We are investing record amounts building a world-class railway that provides more seats, more services and better journeys for passengers.
"The new Intercity Express Trains tick all the right boxes and they will transform travel when they enter service from 2017."
She continued: "The Intercity Express Programme (IEP) is also helping to secure long-term economic growth by creating hundreds of jobs and apprenticeships at Hitachi's new factory in Newton Aycliffe as well as thousands more jobs across the UK supply chain.
"I congratulate Hitachi on the progress they have made and look forward to seeing these trains arrive in the UK."
The Class 800 series trains can operate with five to 12 cars and include air conditioning, bicycle storage space with security locks, wheelchair accessible toilets and space in the cars to accommodate wheelchairs, CCTV, Wi-Fi for passengers, seat reservation display and a full kitchen and catering service.
There will be 19 per cent more seats on each train and journey times between Bristol and London could be reduced by as much as 20 minutes.
Under-floor diesel engine generators will be installed on the trains to allow them to run on non-electrified routes but these can be removed as the rail electrification programme expands.
The first new trains manufactured in Japan are due to be finished by the end of the year and shipped to the UK for test operations in the first half of 2015.
But a total of 866 carriages will be built at the new County Durham factory, creating 730 jobs locally.
The new trains will also be introduced on the East Coast Main Line between London, Leeds, Newcastle and Edinburgh from 2018.
