66085 is topping the train whilst 66213 is on the rear as they pass Cheddington station on the down slow line. This is "The Concrete Cow", 1Z74, 07:49 from Paddington via Southall, Brentford, Colnbrook, West Drayton, Acton Wells to Wembley Yard and Sudbury Junction. The train then continued as 1Z75 to Watford Junction, Milton Keynes and Wolverton Works. Then to Northampton and reverse to Bletchley and across the flyover for another reversal to Fenny Stratford, then Bletchley, Watford Junction and Wembley Central to arrive into Euston at 17:33 - quite a tour! 12:51, Saturday 21st January 2012. Digital Image No. GMPI10838.