As I arrived at Challow on 26 November 2017, there were three ballast trains parked in the engineering possession. The front one (which was already in an unphotographable position) moved off as I walked across the bridge, and the other two started to move up to take its place. I just had time to grab this picture of 66076, but as it only moved to just under the bridge, I had plenty of time to get a better picture of 66230, which can just be seen slowly following it in the background.