The line on the was the former Up Goods, but post Trent The Up and Down goods ceased at Pye Bridge. The former Up Goofs south of Blackwell South was kept as a siding and head shunt for alfreton explosives and chemicals, a couple of wagons of which can be seen top left.
The 20s are taking the siding line (former Up Goods) in order to set (what look like) their empty wagons (prob ex Avenue) into Tibshelf Sidings or Blackwell Sidings,
The route from the Bi-di to the DOWN Main was not a signalled move, "BUT" I was once in the bad of 66034 running around its Doe Hill coal train for Drax and the loco was given permission by Trent to pass the signal at Danger and run onto the DOWN Main in order to run north to Avenue Siding and then back onto its train at DoE Hill. The PROPER! Signalled move was for the train to go to Pye Bridge and cross over there.
There is a story that alegadly the driver of a 40! Did mistake the siding road as a running line and he thought he needed to go to Pye Bridge to come back and smashed through the buffers near Alfretn station, but never seen any pics or evidence for this.
The line was last used as a headshunt/access for Alfreton ECP sometime in the mid-1980s.. it then lay dormant until being re-used as the line for the "Engine shed opencast" and was merely cleared of small trees and grass, once photographed a guy with a sweeping brush clearing it! and the concrete sleepers and track merely used again as though it had been laid only years before instead of the 60 years at least that it had been down..... albeit as a siding during that time.