Christian and co-presenter Mark Walker examine the transport policy choices facing the UK political parties contending to win the 2024 General Election [1:25].  Mark interviews Christian about his latest book - The Liberation Line - telling the heroic story of how the reconstruction of the railways in France after D-Day from June 1944 hastened the Allied victory over Nazi Germany [20:22].  Finally, Christian reflects on an early suggestion of possible disagreement between a possible Labour Government and the Mayor of London on the extent of transport devolution [35:00].