On possibly its first outing on the Great Western Mainline, brand new 800023 passes the site of Ashbury Crossing, Shrivenham, on 15 December 2017 with the late running 5Z01 10:18 North Pole IEP Depot to Bristol Parkway test run. It had worked down from the its birthplace at Newton Aycliffe just four days earlier, running as the 5X80 08:56 Doncaster to North Pole.