Class 117. Western region set L459 with the Driving Motor Second leading on the up main rushing through Southall on a Saturday morning in June 1972 with a train to Paddington. Note the GWR monograms in the seat supports.
Another mystery set as my 1978 & 1988 reference books only list 117 sets in the L series up to L429.
Photo by Michael Taylor, Hamilton, Ontario, Canada. (mtaylor6@home.com)
Website www.members.home.net/mtaylor6