Francis Knight says "Pretty sure this is Greenwood, post-quadrupling through Hadley Wood. The loco is running Down Slow. The pairing with D6100 (see D6100 69524 1959) is on the Up Slow, and I previously suggested at Brookmans Park, a few miles north of this solo shot. This light engine movement could have been in order to collect D6100 and return it to Hornsey. Loco, vegetation and weather conditions very similar between both shots!"