The SECR Q1 class was a class of 0-4-4T steam locomotives of the South Eastern and Chatham Railway. The class was rebuilt from older Stirling Q class locomotives by Harry Wainwright between 1903 and 1917 by fitting the boiler that had been designed for the H class 0-4-4T in 1902–03.Casserley, H.C. and Johnston, S.W., Locomotives at the Grouping 1, Southern Railway, page 42, Ian Allan, 1974,
Numbering Fifty-five locomotives were rebuilt at Ashford works, retaining their previous numbers which were scattered between 12 and 423. No. 324 was renumbered 324A in 1907; this and seven others were withdrawn between 1909 and 1914 (the boilers from these being used to rebuild further Q class locomotives to Q1) leaving 47 to enter Southern Railway ownership on 1 January 1923; between 1923 and 1926 all except seven (nos. 134, 141, 344, 354, 366, 413, 419) were repainted into SR green livery and their numbers were prefixed with the letter A to denote Ashford works. Withdrawal recommenced in 1925, and all had been withdrawn by the end of 1930.
+Rebuilding and withdrawalYear rebuilt Numbers withdrawn Numbers Total in service at end of year1903 4 180, 184, 319, 362 41904 41905 5 81, 134, 181, 303, 407 91906 5 138, 146, 304, 324, 366 141907 2 83, 350 161908 1 361 171909 2 355, 359 2 319, 324A 171910 4 351, 400, 404, 408 1 303 201911 1 181 191912 11 12, 85, 95, 141, 200, 343, 357, 367, 406, 412, 413 2 180, 304 281913 7 115, 168, 344, 364, 365, 403, 416 351914 9 50, 58, 76, 224, 347, 348, 363, 402, 420 2 184, 407 421915 3 354, 419, 423 451916 1 411 461917 1 415 471918–24 471925 3 A224, A348, 354 441926 20 A50, A58, A95, 134, 141, A168, A343, 344, A350, A357, A359, A363, 366, A402, A403, 413, A415, A416, 419, A423 241927 9 A12, A76, A85, A138, A347, A351, A355, A404, A420 151928 8 A81, A83, A115, A146, A200, A365, A406, A411 71929 5 A361, A362, A400, A408, A412 21930 2 A364, A367 0
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