31417 passes White Waltham on 8 April 1990 with the 9X03 West Ruislip to Crewe LUL underground stock for refurbishment. This was a regular Sunday working during 1989 and 1990, and was certainly an odd sight, moving slowly up the relief line to Didcot, where it was staged overnight. White Waltham is an interesting location if your interest extends to other forms of transport, as the bridge at this location overlooks White Waltham airfield, which often has some unusual light aircraft types on view.