Gathurst was one of the locations which I worked to when I was a Guard at Springs Branch, the other was Chorley ROF, served by sidings near. Euxton Junction. At Gathurst the wagon nearest the buffers was loaded first. That meant dragging the whole lot out before leaving the loads on the main line, with the barrier wagons and then putting the empties back. The empty coal wagons were from Southport and were used as barriers. When the narrow gauge line closed the explosives were moved in lorries like the one seen at the far end of the sidings. IIRC they were short wheelbase Ford Ds. It was only a few hundred yards from the factory gate, over the canal bridge and through the station car park to reach the sidings. The explosives were for commercial use, though I`m not sure where.
At Chorley ROF, obviously the explosives were for military use. The empty wagons were taken into depot by an MOD loco and loaded wagons pushed back out, BR staff were not allowed beyond the gates. Security staff were present at all times during shunting. Reporting numbers were 6F83 Walton Old Junction to Chorley ROF, which also conveyed traffic for GKN at Douglas Bank, near Wigan Wallgate and Metal Box at Westhoughton. The return working was 6F82 Chorley ROF to Arpley Sidings, via Preston.
The Gathurst train was a trip working from Springs Branch, which ran round at Burscough Bridge, if there was no traffic for Southport. Target 72, 85 and 90 were used at different times.