WD 2-8-0 No 90618 passes Potters Bar with what was described as an up coal train on 14 May 1960, it is running under Class H 'Through Freight or Ballast Train' headlamps. Given the late date it is unusual that all the wagons are wooden and many are 5 plank 'merchandise' wagons so I suspect this is actually not a coal train.

Photo: K.L. Cook / Rail Archive Stephenson