More information : The Royal Ordnance Factory at Chorley is centred at SD 563 210, 3km north-west of the town of Chorley straddling the Chorley to Preston railway line.
The site for the new Royal Ordnance Filling Factory at Chorley was chosen in March 1936 (1a) and the contract for its construction was placed in January 1937 (1b). Locational factors that influenced its siting included; its position in the west of England away from continental bombers, good railway communications and a large flat open area for the dispersal of buildings. Though this area of Lancashire was not classified as a depressed area, a readily available supply of labour could be brought by train from Blackpool, Liverpool and Manchester. The factory was laid out on a green field site covering 875 acres (354.25 hectares) encompassing the farms of Old Worden Hall (SD 52 SE 5), Buckshaw Hall (SD 52 SE **) and Jones' Farm. At the time it was one of the largest construction projects in the world employing up to 15,000 workers at a cost of upto 12, 000 000. During its construction three million cubic yards of earth were moved and 1,600 buildings constructed in the space of less than two years. The work was sufficiently advanced for production to begin in late 1938 or early 1939, the factory was officially opened by George VI in March 1939. A shadow factory mirroring the production facilities at Chorley was built at Glascoed, Gwent.
Chorley was one of an interconnected network of Royal Ordnance Factories built during in the late 1930s and early 1940s as part of Britain's rearmament programme. It was one of the largest Filling Factories built in England and was constructed as one of the permanent factories rather than others that were constructed for the duration of the war. Its function was the assembly of munitions, the filling of shells and the assembly of detonators, fuses and primers using explosives and projectiles manufactured elsewhere. Although not primarily concerned with the manufacture of explosives, a small gunpowder establishment was built in the south west corner of the factory. It is unclear whether this plant was manufacturing gunpowder or processing gunpowder produced elsewhere. Chorley was also involved in the manufacture of cordite rocket motors for 3 inch rockets using a solid propellant of perforated cordite. These rockets were used for air defence, air to surface rockets or coastal bombardment and represented an area of rocket development where Britain, for a short time possessed a world lead. The factory is divided into two unequal parts by the Chorley to Preston railway line running roughly east to west. To the south of the railway line and bordering on to Euxton Lane are the administrative buildings, a canteen and residential accommodation attached to the factory. Some demolition of the original factory buildings has taken place in this area and new small factory units erected in their place. This section of the factory is connected to the larger production area north of the railway line by a substantial road bridge over the railway at the southern end of the main north to south spine road. Adjoining the road bridge is the purpose built factory railway station that conveyed many of the 30, 000 wartime workers to and from the factory. The station remains intact although overgrown and derelict. The wartime factory was also almost exclusively served by rail bringing in material from the engineering and explosives factories. Trains were marshalled in exchange sidings to the north of the railway station served by a series of warehouses from where empty shell cases and explosives were moved to the filling buildings before storage in underground factory magazines. The whole factory formerly served by an internal standard gauge railway network 25 miles in length, linking the underground storage magazines to the exchange sidings to remove munitions from the factory. At the time of the investigation most of the railways had been lifted except where the rails were set into concrete roadways.
In common with all explosives handling factories the factory is divided into distinctive groups according to function and areas within the factory further designated as `clean' where explosives are handled and all other areas as `dirty'. Other features common to explosives factories included the wide dispersal of buildings, the provision of concrete and earthwork traverses or blast screens between buildings and where the topography allowed the sinking of buildings below ground level. Steam for heating buildings or process machinery was generated in a central boiler house and distributed around the site by 97 miles of steam mains. Electricity in an 11 Kv network was distributed by 3 ring mains serving 16 substations. Additionally there were three air compressor stations delivering 4K cu ft/min (1b). Other central services included the provision of water mains to supply the fire fighting and individual drencher systems within the buildings along with an internal telephone network. Apart from the building specifically engaged in the production of explosives scattered around the factory are small offices, shift rooms where the workers changed before passing into the `clean' areas, canteens and toilets. Also dotted around the factory and its perimeter are a series of pillboxes or observation posts.
The north-west corner of the factory is designated Group 3, this area was concerned with the manufacture of fuses and primers. The buildings in this area are long single storey shops divided into bays. The buildings separated from one another by concrete blast walls with air raid shelters in between. The buildings variously housed gunpowder and cordite pellet presses and fuse assembly shops. As a further safety feature the electric motors powering overhead belt drives were housed in external rooms, as were the oil hydraulic pumps at the ends of the buildings. The buildings were individually heated by Plenum heaters converting the centrally generated steam heat into warm air that was distributed around the building through overhead pipes.
This group is separated from the Group 1 buildings in the southwest corner of the factory by the valleys of Buckshaw and Worden Brooks covered by Worden Wood. In the bottom of the valley adjacent to the boundary fence is a pumphouse used to supply water to the emergency fire fighting system. The Group 1 buildings were used for the filling of caps, primers and 0.303, 0.300mm and 9mm small arms ammunition. The buildings are similar in form, single storey brick built filling shops with a large central room. To either end are covered porches and at one end a separate compartment to house an electric motor powering the overhead drive shaft. Completed components were passed on trays through a serving hatch into a separate room on the side of the building for packing.
In the north-eastern corner of the factory are the subterranean Group 5 magazines used for the storage of the products of the Group 5 buildings principally cordite rocket motors and primers. The five magazines that comprise the Group 5 magazines are each served by a covered railway loading area, each magazine divided into a series of chambers capped by a massive earthen mound. The production buildings in Group 5 consist of small single storey buildings with a single large room in the centre with covered entrances to either end. The buildings and connecting walkways are set below ground level providing a screen of earth between each building. Associated with this as with the other large groups of buildings is large shifting room and canteen.
The buildings of Group 5 are separated from those to the south Group 8 by a series of underground storage magazines served by the factory railway system. The Group 8 buildings may be further subdivided into those connected with fuse assembly and those used for filling. The fuse section in the south-west corner of the group is distinguished by relatively small shops unprotected by traverses or concrete walls, as the amounts of explosives handled in any one building is relatively small. The buildings used for the filling of munitions may be separated into two principal types known colloquially in the factory as the `Queen Mary' buildings and the `Butterfly' buildings. The `Queen Mary' buildings are long double storey buildings surrounded by earthwork traverses, a number of which have been raised by concrete blast walls or Braithwaite tanks filled with earth. The buildings take their name from the funnel like protrusions through their roofs. These are the tops of circular double skinned steel casings that formerly housed the process machinery within the buildings. In one of the buildings recorded Group 8 J40 the casings were separated by belt driven `Harvey' mixers and in one of the casings an incorporator remained in place. The `Butterfly' buildings, after their symmetrical form, comprise a central room flanked by two long single storey buildings divided into bays. All the buildings were sunk below ground level to provide a protective screen of earth between neighbouring buildings. The `Butterfly' buildings were originally built for the processing of lyddite, the central rooms formerly occupied by belt driven `Harvey' mixers, the electric motors for the belt drive housed in a separate room.
In the south-east corner of the factory was the gunpowder section. The buildings of the gunpowder section have been demolished and its site is occupied by more recent process buildings. The basic functional areas within the factory survived into the post-war period. Where new manufacturing processes were introduced these either were accomodated in older buildings or where specialised buildings were required sections of the older factory were demolished to make way for new building.
At the time of investigation the redundant areas of the factory were being stripped in preparation for demolition and further sections of the factory were earmarked for closure. (1)
Recent aerial photographs (2003) show part of the site, around SD 5724 1990, apparently under demolition. Most of the rest of the site has been cleared and the areas around SD 5640 2119 is starting to be re-developed for housing. (2-3) |