Under the watchful eye of a rail worker, L417 (51396 & 51354) crosses from the up relief to the down relief line at West Drayton on 22 June 1991. Both relief lines were closed for engineering works to the east of this point. The unit had just arrived as the 13:20 Slough to West Drayton Network SouthEast service, and would later depart as the 13:45 West Drayton to Slough. Note that the unit is running without its centre car (59506).