L423 (51361, 59513 & 51399) was easily recognisable from a distance in the mid 1980s by virtue of the plated over headcode box on the front of DMBS 51361. The unit is seen here passing Appleford Crossing Signal Box (since demolished), and still accelerating away from the Appleford station stop with the 09:24 Oxford to Paddington 'all stations' service on 12 September 1985.