Having worked up from Derby to Marylebone earlier as 5Z72, Chiltern's brand new 172104 is working back from Marylebone as 5Z74, 13:03 to Derby Litchurch Lane. It was due to stop at various stations en route and also to visit the LUL siding at West Ruislip. It is seen here approaching the foot-crossing at Kingsey at 14:18, once again running a few minutes early. Monday 16th May 2011. Digital Image No. GMPI9074.