As under secretary, he will be responsible for major rail projects, rail safety and security, passenger services, transport funding, accessibility, and rail fares and ticketing.
He said: “I’m very, very honoured to be asked and I’m certain there will be a big challenge ahead of me in transport. There will be no lessening of my work in my own constituency - I will just have to work that bit harder.
“I’m always keen to make sure that no matter what situation I find myself in I continue to work on behalf of the people I represent.
“It will be a great challenge and an opportunity to serve my constituents and the country.”
Mrs May announced a number of ministerial positions over the weekend.They included Penny Mordaunt and Mike Penning, who became ministers at the Department for Work and Pensions and Ministry of Defence.