<p>Operator that runs services between London Marylebone and Birmingham is sixth to be nationalised since 2025</p><p>Chiltern 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.</p><p>The operator, which runs commuter rail services on the Chiltern mainline between London Marylebone and Birmingham, on Sunday became the sixth to be <a href="https://www.theguardian.com/business/2025/m