Operator that runs services between London Marylebone and Birmingham is sixth to be nationalised since 2025Chiltern Railways has become the latest train operator to enter public ownership as the government closes in on its ambition to renationalise all major passenger rail services.The operator, which runs commuter rail services on the Chiltern mainline between London Marylebone and Birmingham, on Sunday became the sixth to be nationalised under Labour, with the remaining four to follow by the e