37899 Sir Gorllewin Morgannwg / County of West Glamorgan approaches Circourt Bridge, Denchworth with the 6Z86 15:07 Didcot Power Station to Cardiff Tidal Yard oil empties on 27 October 1994. Superb late afternoon lighting with the sun just spotlighting the train, while the background is in shadow and with a threatening dark sky to the east. At this time the up and down relief lines had only just come into use.