Although nominally in competition, the four companies worked together on projects of significance to the railway industry as a whole. During
World War II, the railway companies' managements were united, effectively becoming one company, under the direction of the
Railway Executive Committee. The railways were hired by the Government from 1 January 1941, to continue for one year after the end of the war. In return, a fixed Annual Rent of £43,468,705 was payable, divided between the companies according to a set formula. A commission was set up under the chairmanship of Sir
Ernest Lemon to consider the post-war planning and reconstruction of the railways, with representatives of the Big Four and the
London Passenger Transport Board.
Joint lines Each company operated a number of lines jointly with one or more of the others, a situation which arose when the former joint owners of a route were placed into different post-grouping companies. Most of these were situated at or near the boundaries between two or more of the companies; however there were some notable examples which extended beyond this hinterland zone. The number of jointly operated lines was greatly reduced by the grouping but a substantial number survived, including the
Cheshire Lines Committee, the
Forth Bridge Railway, the
Midland and Great Northern Joint Railway (all LMS/LNER) and the
Somerset and Dorset Joint Railway (LMS/SR). At in excess of 180 track miles, the M&GN was the largest jointly operated network in Great Britain, and extended from Peterborough to the East Anglian coast. It was wholly incorporated into the LNER in 1936. The S&D connected Bath and Bournemouth, and wound its way through territory otherwise dominated by the GWR. The LMS was responsible for its locomotives and the Southern for the infrastructure. Initially, the S&D had its own locomotives but these were absorbed into LMS stock in 1930. Further simplification of the railway map, long advocated, was not achieved until nationalisation. One joint operation, the
Fishguard & Rosslare Railways & Harbours Company, which Irish independence had rendered international, survives to this day.
Road transport The Big Four inherited and developed networks of feeder bus services, and after 1928 began to acquire majority shareholdings in local bus companies, such as the
Bristol Tramways and Carriage Company,
Crosville and
United Automobile Services. However, railway involvement in bus operations was transformed in the period 1928–30. The companies’ legal powers to run bus services were unclear and each promoted private legislation (the Road Powers Acts of 1928) to obtain clarity. Concessions were demanded in return, including the key one that the railways would refrain from taking a controlling interest in bus undertakings. This led the companies to enter into partnerships with the bus combines:
British Electric Traction,
Scottish Motor Traction and
Thomas Tilling, also the
National Omnibus and Transport Company, soon afterwards absorbed by Tilling. The railways relinquished the majority stakes they had already acquired but also bought substantial minority shareholdings in other companies in the combine groups. Eventually there were investments in 33 bus and coach companies. Where there was a local monopoly of rail services the agreements were bilateral but where inter-penetrating lines were common, there were two railway companies with minority shareholdings, for example,
Devon General and
Thames Valley Traction (both GWR/SR), Crosville and
Midland Red (both GWR/LMS), and
Eastern Counties,
Eastern National,
East Midland Motor Services,
Hebble Motor Services,
Lincolnshire Road Car,
Trent Motor Traction,
West Yorkshire Road Car,
Yorkshire Traction and
Yorkshire Woollen District Transport (all LMS/LNER). The LMS and LNER also sat with the local authority on Joint Omnibus Committees in Halifax and Sheffield.
Other activities Air services were another area of co-operation. The GWR, LMS and Southern acquired British and Foreign Aviation, Ltd. and formed
Railway Air Services Ltd. Channel Island Airways, Ltd. and its subsidiaries (
Jersey Airways, Ltd. and Guernsey Airways, Ltd.) were wholly owned by the GWR and Southern.
Thomas Cook & Son having come into Belgian ownership, its impounded shares were sold by the British Custodian of Enemy Property to the Big Four. ==Continuity==