66569 approaches Circourt Bridge, Denchworth, on 29 July 2021 with the 4L36 07:39 Wentloog to Felixstowe North freightliner. This had left South Wales 81 minutes late, and was still an hour behind time at Swindon. It was there that something unusual happened. It crossed over onto the down line, and proceeded to Uffington 'wrong line' (although of course the lines are bi-directionally signaled). At Uffington the road was set for it to cross back onto the up line, but then set back so that the 1A16 10:30 Bristol Temple Meads to Paddington wouldn't be delayed. However, both the 1G11 10:28 Paddington to Cheltenham Spa, and the 1C10 10:32 Paddington to Bristol Temple Meads trains were now sat at red signals, as the freightliner was blocking their route west!