Midland Railway 1121 Class

The Midland Railway 1121 class was a class of 0-6-0T tank locomotives designed by Samuel W. Johnson for the Midland Railway. Fifty-five were built between 1895 and 1900: ten by the railway company's Derby Works, five by Sharp, Stewart and Company, and the remaining forty by Robert Stephenson and Company.

Midland Railway 1121 class
LMS 1874
Type and origin Power type Steam Designer Samuel W. Johnson Builder Derby Works (10) Sharp, Stewart & Co. (5) Robert Stephenson & Co. (40) Build date 1895–1899 Total produced 55
Specifications Configuration: ​  • Whyte 0-6-0T  • UIC C n2t Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 4 ft 6 in (1.372 m) Wheelbase: ​  • Axle spacing (Asymmetrical) 7 ft 4 in (2.235 m) + 8 ft 2 in (2.489 m) Boiler MR type A1 Boiler pressure 160 lbf/in2 (1.1 MPa)[1] Heating surface 1,120 sq ft (104 m2)[1] Cylinders Two, inside Cylinder size 17 in × 24 in (432 mm × 610 mm)
Career Operators Midland Railway London, Midland and Scottish Railway British Railways Power class 1F Numbers MR: 1121–1130, 2248–2252, 2361–2390, 2571–2580 LMS: 1845–1899 BR: 41846–41890 (with gaps) Locale London Midland Region Withdrawn December 1930 – July 1963 Disposition All scrapped

Construction history

The class were a development of the 1377 class “half cabs”. They differed by having the A1 type boiler in place of the earlier's type A. The wheelbase was stretched by 6 inches (150 mm) – all between the main and rear driving wheels. They also had a full cab.

Table of orders and numbers^[2]

Original No.	1907 (& LMS) No.	Manufacturer	Works Nos.	Qty	Year	Notes
1121–1130	1845–1854	Derby Works	(order no. 1395)	10	1895
2248–2252	1855–1859	Sharp, Stewart & Co.	4062–4066	5	1895
2361–2390	1860–1889	R. Stephenson & Co.	2931–2960	30	1899
2571–2580	1890–1899	R. Stephenson & Co.	2961–2970	10	1899–1900

Post-Midland Railway

All 55 passed to the London, Midland and Scottish Railway (LMS) at the 1923 grouping in 1923. Withdrawals started in 1930, and by 1948, when the railways were nationalised, 23 locomotives passed into British Railways ownership, and were allocated numbers 40000 higher than their LMS numbers, although five were withdrawn before the new numbers were applied. Withdrawals continued, with the last one, 41875, taken out of service in July 1963.

None were preserved.

Table of withdrawals^[2]

Year	Quantity in service at start of year	Quantity withdrawn	Locomotive numbers	Notes
1930	55	6	1861/66-67/81/97/99
1931	49	4	1858/62/82/86
1932	45	10	1845/48/68/72/80/83/87-88/96/98
1933	35	4	1863/77/92/94
1934–37	31	0	–
1938	31	1	1849
1939	30	1	1851
1940–45	31	0	–
1946	29	3	1864/71/76
1947	26	3	1850/84/91
1948	23	2	1870/93
1949	21	1	1874
1950	20	2	1895, 41873
1951	18	3	1856, 41852/54
1952	15	1	41890
1953	14	2	41846/49
1954	12	1	41853
1955	11	3	41859/65/89
1956	8	1	41885
1957	7	1	41860
1958	6	0	–
1959	6	2	41857/78
1960	4	3	41847/55/79
1961–62	1	0	–
1963	1	1	41875