66551 passed Worting Junction with 4M55, the 09:14 Southampton MCT to Garston FLT intermodal, on the morning of 15 July 2022. This train follows an unusual routing, taking the Salisbury line out of Southampton then running via the Laverstock Loop to Basingstoke. At Reading it leaves the usual route again and runs via Slough and Acton to join the WCML at Willesden.