A stranger on the Great Western Mainline! Class 150s have never been common in the Thames Valley, with virtually all workings operated by Class 165 & 166 'Turbos'. However, an interesting positioning move took place on 12 November 2007, when 150127 was being transferred from its former Bedford to Bletchley Silverlink duties to a new life with First Great Western. It is seen here passing Cholsey with the 5Z74 12:00 Willesden to Bristol ,St Philips Marsh ECS. There are various instances on this site of locos or units in different ownership, but this is a record of the actual movement from one owner to another!