The trains' red exterior has been replaced to reflect the season, and a Pendolino model has been transformed into a Penguilino, meanwhile the Class 91 has come to be known as Claus 91.
The bespoke Christmas designs are the work of nine-year old Amber Maxfield and 11-year old Madeleine Deakin, who won a nationwide Christmas train design competition for primary school children.
While the trains sport separate designs – one for each of the winners, they are both complete with a midnight blue sky backdrop, and each train features the name of its designer.
The competition was run in partnership with the Book Trust, and its juding panel was headed up by Jill Murphy, author of the Worst Witch and The Large Family series.
The Christmas trains will run on the Virgin Trains network throughout December, transporting passengers throughout the festive period.
Patrick McCall, chairman, Virgin Trains, said: "We loved the concepts that these two young designers came up with and are proud to have their ideas transform two trains. It’s fantastic that both the East Coast and West Coast services have come together to make our customers’ journeys throughout December extra special - especially on their way home for Christmas."
Diana Gerald, chief executive, Book Trust added: "This project has been a great opportunity to inspire children to use their imaginations and we were really impressed with the quality of entries. We received everything from family party scenes to our most beloved Christmas characters."
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