L220 (51207 & 54405) crosses North Fen (near Waterbeach) on 14 September 1991 with the 10:37 King's Lynn to Cambridge Network SouthEast service. Class 317 EMUs would take over from the venerable Metro Cammell units the following year, when the newly installed wires seen here were finally switched on. As a result, L220 was withdrawn shortly afterwards, and cut up in 1993.