The SECR E class was a class of 4-4-0 tender locomotives designed by Harry Wainwright for express passenger trains on the South Eastern and Chatham Railway. It was a larger version of the D class incorporating a Belpaire firebox Overview Following the success of his D class 4-4-0 design, Wainwright obtained authority to build a further five similar locomotives incorporating a Belpaire firebox to provide additional power. These were built at Ashford railway works during the last few months of 1905 and entered traffic early in 1906. Once the design had proved to be successful, further orders were placed until 26 had been constructed at Ashford by April 1909. In 1911 and 1912 two examples of the class received boilers with superheaters, which significantly improved their fuel efficiency, but unfortunately the additional weight prevented them from working over the lines of the former London Chatham and Dover Railway (LCDR) and so no further examples were so treated. E1 class In 1917 the SECR Board decided that when the London to Dover and Folkestone boat trains were reinstated after the war, they would be centred on London Victoria railway station, using the LCDR lines. This created a serious problem of producing a locomotive with sufficient power but with an acceptable axle load. Richard Maunsell therefore ordered the rebuilding of one example with larger cylinders, boiler and firebox, while at the same time reducing unnecessary weight elsewhere in the locomotive. This work was largely undertaken by his Chief Locomotive Draughtsman James Clayton. The experimental rebuilding was implemented following the Armistice in November 1918 and proved to be successful. A further ten examples were rebuilt by Beyer, Peacock and Company during 1919 and 1920, and ten more were supposed to follow in 1921, although at the last minute ten D class locomotives were rebuilt instead following the same principles. Operation The class was used on the London to Dover and Folkestone boat trains and other Kent coast expresses on the South Eastern Main Line. Locomotive No 506 was used to haul the train containing the Cavell Van ( No 132) bringing back the reamians of the Unknown Warrior from Dover to London on 10 November 1920. After 1914 they were replaced on the heaviest express trains by the L class 4-4-0 on the lines of the former South Eastern Railway but they remained the heaviest locomotives allowed on the LCDR lines until the