Sporting the new First Great Western dark green livery, 166204 leaves Long Marston on 7 August 2015 with the 5Z12 12:00 Long Marston to Reading Traincare Depot ECS move, which on this occasion was terminated at Didcot Parkway. As is quite common with departures from Long Marston, this did not wait for the booked time, in this case leaving 43 minutes early. The unit had visited the site for modifications to its air conditioning system. The driver had brought in 166221, which can be seen in the background. This will have the air con work carried out over the next few days. The green livery had been applied the previous month, and is the first unit to be painted in the colour scheme, although as yet without any branding.