The surprising appearance of a Class 33 at Shrivenham on the evening of 29 May 1986. 33034 approaches the site of Ashbury Crossing with a rake of Mk1 stock heading east with an unidentified working. There is nothing in the working timetable, and the 25 headcode doesn't help. Class 33s were never common on the Great Western Mainline, so this is definitely worth a picture.