What I believe to be DR77002 passes through Tring station
on the up slow relief line. It was running as 6J99 and had made the not-inconsiderable journey from Guide Bridge in Manchester leaving at 10.15 heading for Willesden Yard no doubt in preparation for forthcoming engineering works. I like the framing of the brightly coloured SB Rail Tamper Regulator unit through the dark bridge at the northern end of the station.