1895, speeds of the Scotch expresses were limited, the time for the between the capitals being a pedestrian eight hours 15 minutes. However, subsequent to valve gear modifications, the A1 locomotive's coal consumption was drastically reduced, and it was thus found possible to run the service non-stop with a heavy train on one tender full of coal. Ten locomotives of Classes A1 and A3, which were to be used on the service, were provided with corridor tenders; these avoided engine crew fatigue by enabling a replacement driver and fireman to take over halfway without stopping the train. During the General Strike on 11 May 1926, the Flying Scotsman was derailed by strikers near Newcastle. No. 4472 hauled the inaugural non-stop train from London on 1 May 1928, and it successfully ran the between Edinburgh and London without stopping, a record at the time for a scheduled service (although the London, Midland and Scottish Railway had four days earlier staged a one-off publicity coup by running a non-stop Royal Scot service from Euston to Edinburgh via Glasgow—). The Flying Scotsman had improved catering and other on-board services—even a barber's shop. With the end of the limited speed agreement in 1932, journey time came down to 7 hours 30 minutes, and by 1938 to 7 hours 20 minutes. Corridor tenders The non-stop runs were achieved with a special corridor tender which had an increased coal capacity of nine tons instead of the usual eight. A driver and fireman were able to access the locomotive from the train through a narrow passageway inside the tender tank plus a flexible bellows connection linking it with the leading coach. The passageway, which ran along the right-hand side of the tender, was high and wide. Further corridor tenders were built at intervals until 1938, and eventually there were 22; at various times, they were coupled to engines of classes A1, A3, A4 and W1, but by the end of 1948, all were running with class A4 locomotives. Use of the corridor tender for changing crews on the move in an A4 loco is shown in the 1953 British Transport Films' Elizabethan Express, the name of another London-to-Edinburgh non-stop train. British Rail In the late 1950s British Railways (BR) was committed to dieselisation, and began devising a replacement for the Gresley Pacifics on the East Coast Main Line. On 6 October 1958, haulage of the service by