The Railway Magazine of February 1922 introduced its readers to the advantages of ‘demountable flats’. ‘Demountable flats’ significantly improved the loading and unloading of consignments of goods on railways and road motor vehicles. ‘Demountable flats’ made it possible to transfer a load from one to the other or vice versa in a few minutes. The result was a significant “saving in time and labour. … The system, which [was] capable of considerable extension, [was] finding favour on several railways. It [had] recently been adopted by the London and South Western Railway with great advantage and two illustrations [were] reproduced [in their article] showing the arrangements employed.” [1: p137-138]

“The old method of collecting goods was to despatch a pair-horse van with two men at 9 a.m. each day to pick up a load. The horses and men were compulsorily kept idle while the goods were loaded piecemeal, the van eventually returning to the goods yard with its load and frequently being unable to perform more than one return journey in the day. Under the new arrangement a motor lorry leaves the depôt at 9 a.m. with an empty demountable flat to pick up a load. Upon arrival the flat is pushed or lifted off the chassis and a loaded one transferred thereto by similar means. The lorry is able to return with this load at 10 a.m., the load being then transferred to the stand-dray, after which the motor sets out again on another trip at about 10.15 a.m., carrying an empty flat as before.” [1: p138]

“Horses are harnessed to the stand-dray to which the first load was, as stated, transferred, and haul it to the goods siding ready to load it on to a wagon of the goods train. By this means loads collected late in the afternoon can be delivered at far distant points early the following day per goods train. Also six return journeys can be accomplished in a day, whereas previously this might necessitate the employment of twelve men and six pairs of horses. The inward traffic or goods delivery is conducted on the same lines and with the same saving of time and labour. The wheels of the demountable flats illustrated are fitted with self-aligning ball bearings, which considerably facilitate the ease of handling of the flats, especially in their loaded condition.” [1: p138]

These revised methods of working were relatively novel in 1922. As can be seen in the text above,, working patterns were changing and manual labour was becoming less important as more mechanised operations were undertaken. No doubt, the reduced number of men required for these operations eventually saw redundancies.

“The larger the unit loads the greater the reduction in handling time for a given quantity of cargo. To make economic sense any container system has to be widely adopted, prior to the 1930s this meant that the majority of containers used were for bulk flows of minerals.” [4]

The presence of an article focussing on the use of ‘demountable flats’ in The Railway Magazine might suggest that they were a relatively early form of ‘unit load’ used on the railways. Their use was certainly a development in a flow of innovation in the movement of goods across different modes of transport. They were, though, effectively, but loosely, a form of ‘containerisation’. And containers had, by 1922, been around for some time, “various kinds were in regular use on the canals from the 1780s and wooden containers were adopted by the Liverpool & Manchester line in the 1830s for both coal and general goods.” [4]

“The Liverpool & Manchester Railway built open frame ‘skeliton (sic) wagons’ to carry rectangular bottom-door coal containers already in use of the canals but used their standard flat wagons to carry Pickfords general goods containers.” [4]

Although some of the mineral ‘containers’ “travelled on specially built wagons a lot were carried in three and four plank standard open wagons.” [4]

In 1841 Brunel introduced iron mineral boxes/containers in South Wales to protect friable coal. Cranes then lifted these containers into the holds of ships at Swansea docks. They were then emptied using bottom doors. 8ft long by 4.5ft wide, these containers were carried four to a wagon. [4]

During the pre-grouping era, containers were also used for passenger luggage where that luggage needed to be loaded onto boats travelling to the continent. Certainly, both the Great Eastern Railway and the South East & Chatham Railway provided this service. [4]

“By about 1900 road furniture vans were fitted with removable wheels so they could be moved on standard railway wagons, these evolved into covered furniture containers by the time of the First World War. Building on the work done by the pre grouping (pre 1923) companies railway container designs were standardised during the later 1920’s. The new RCH approved standard containers were based on the existing designs of the time. This move was mainly lead by the LMS who began promoting containers in 1928 in order to counter the competition from road haulage companies for door-to-door services.” [4]

By the 1930s, furniture and some high value items were being carried in containers. In the late 1930s almost all meat transportation by rail was undertaken using dedicated containers.

“British railways built many thousands of containers, mainly to the standard pre-war ‘van’ type designs. Up to the 1960’s it was usual to send containers through the system as single loads, hauled in standard mixed goods trains but under British Railways all-container ‘liner’ services began to emerge in the late 1950s.” [4]

The breweries used tank wagons of both the fixed and ‘demountable’ kind for beer and spirits. “Guinness developed a steel tank in the 1940s that could be carried in ordinary open wagons but demountable beer tanks were in effect containers and ran on purpose built chassis. Bass built up quite a fleet of these tanks, some of which were later used for other work, one example being the movement of glue to chipboard factories. This latter traffic was carried throughout the 1950s and 60s but … transferred to road in the 1970s. There were a few demountable tanks carried in pairs on a single wagon, Scottish and Newcastle had two of these and Truman’s had one (which could carry either two tanks or a single tank mounted … centrally).” [2]

‘Conflats’ were developed, in the era before nationalisation of the railways. ‘Conflat’ was the telegraphic code within the GWR’s “coding of railway wagons for a container wagon. Unlike normal wagon loads, containers were only listed to carry furniture or goods (unless they were refrigerated containers, which carried frozen products kept cold by ice) which needed to be placed on a specialist flatbed wagon which had train braking capability due to the fragile nature of the products carried.” [3]

These “wagons were removed from service (as were the containers themselves) when more modern containers came into use.” [3]

“British Railways used several standard types of wagon. The Conflat A, which could carry one type ‘B’, or two type ‘A’, containers, was the most common. It was regularly used to carry AF (frozen food) containers: while the Conflat L, which could carry three smaller containers for bulk powders, was also produced in large numbers. … The Conflat B wagon could carry 2 AFP (frozen food) containers. These were slightly wider than the standard AF containers, and were designed to carry loads on pallets.” [3]

Innovation continued through the 1950s, 1960s and 1970s, but this discussion has taken us quite a distance from the ‘demountable flats’ of the 1920s and their dramatic impact on goods handling.

References

1. The Railway Magazine, February 1922, p137-138.
2. https://www.igg.org.uk/gansg/7-fops/fo-grain.htm, accessed on 3rd September 2024.
3. https://en.m.wikipedia.org/wiki/Conflat, accessed on 3rd September 2024.
4. https://igg.org.uk/rail/5-unit/unitload1.htm, accessed on 16th September 2024.