The stick on 'headboard' explains it all here. L420 (51358, 59510 & 51400) & L402 (51335, 59487 & 51377) stand at Bicester Town station on 9 May 1987, having just arrived with the inaugural reopening special from Oxford. The wires above the DMU were attached to a blimp. Also, a parachute team was making a descent, which explains why the man on the left is looking skyward!