Speaking to the BBC, Alexander said the government had made a manifesto commitment to bring the privately owned train operating companies into public ownership.
She said this was “because we know that for years people have had to put up with delays, cancellations, the frustration of standing on a platform on a Sunday and the train just never arriving”.
Alexander continued: “Every year we’ve been giving up to £150m in management fees to private train operating companies and we don’t think that can be justified.
“Great British Railways is a new publicly owned company that will have integrated management of not only the day-to-day running of the trains but also the infrastructure, the tracks and the signalling.
“We think that you can run a more efficient service and also one where you tackle problems of punctuality and reliability.”