Some 122 of the new Class 800 Hitachi trains are due to be in service on GWR and Virgin Trains East Coast services by 2020, replacing the Intercity 125 fleet.
The Hitachi 800 engine will be faster and carry more passengers and will run on GWR for the next 27 years.
Passengers on that service also had to deal with a broken air conditioning unit, which saw water cascade into a carriage.
He added: "Unfortunately, the train was delayed this morning due to a minor technical matter that was quickly resolved at the depot".
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Court of Appeals for the Fifth Circuit, and until the Fifth Circuit issues a ruling on the petition". That meant the measures agreed upon in the collective bargaining agreement had not been exhausted.
The air conditioning had to be turned off, after the leak was spotted.
Hitachi Rail Europe's managing director Karen Boswell said that the achievement was the culmination of nine years of hard work - from creating the £82 million factory at Newton Aycliffe to recruiting a 1,000-strong workforce.
The problems prompted complaints on social media by passengers.
The first all-new British inter-city train for 40 years made its maiden journey Monday as part of a 7.6-billion US dollar investment to improve rail travel between Britain's main cities.
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The train was due to leave Bristol for London with Grayling, transport and business bosses and commuters at 6am, but did not leave Temple Meads until 6.25am. "This is another major step forward in the biggest ever transformation on the Great Western Mainline as we deliver more trains, more seats and better journeys for communities across the route".
She added: "We are really proud to have built trains in the United Kingdom, designed using Japanese bullet train technology, which are improving passengers' journeys on the Great Western route".
The 10-carriage service has 24 per cent more seating capacity than its predecessor, the High Speed Train, and will boast 40 per cent more seats.
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