166217 passes Cassington on 24 March 2018 with the 5Q66 13:32 Reading Traincare Depot to Long Marston ECS. As most Class 166s migrated to the Bristol area in late 2017, the class is now a comparative stranger to the Cotswold Line, after over two decades of being commonplace. The units are visiting Long Marston for modifications, with the usual pattern being one in and one out on the same day. Note the recent vegetation clearance at this location, which has revealed some old telegraph poles, which had been felled in the late 1970s.