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The Midland Railway 6 Class was a class of ten 0-4-4T steam locomotives. They were built at Derby Works in 1875. A development of the earlier 0-4-4WT of the 690 and 780 classes, but being the first Johnson engines, had side tanks instead of back tanks.

Midland Railway 6 class
Type and origin Power type Steam Designer S. W. Johnson Builder Derby Works Order number 1 Build date 1875 Total produced 10
Specifications Configuration: ​  • Whyte 0-4-4T  • UIC B2′ n2t Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 5 ft 3 in (1.600 m) Trailing dia. 3 ft 0 in (0.914 m) Wheelbase:  • Engine 8 feet 9 inches (2.667 m) + 9 feet 9 inches (2.972 m) + 5 feet 0 inches (1.524 m) Loco weight 43 long tons 6 cwt (44.0 t) Fuel type Coal Boiler: ​  • Model Midland Railway Class C  • Diameter 4 ft 1 in (1.245 m)  • Tube plates 10 ft 6 in (3.200 m) Boiler pressure 160 lbf/in2 (1.10 MPa) Heating surface 1,254 sq ft (116.5 m2) Cylinders Two, inside Cylinder size 17 in × 24 in (432 mm × 610 mm)
Career Operators Midland Railway London, Midland and Scottish Railway Withdrawn 1925–35

The original MR numbers were 6, 15, 18, 137, 140–144 and 147. The 1907 numbers were 1226–1235. All passed to the LMS in 1923, but they were all withdrawn and scrapped by 1935.

An abortive attempt was made to preserve the first of the class (No. 1226, which was withdrawn in 1930) and repainted back into its original livery and renumbered 6. However, new chief mechanical engineer William Stanier ordered it scrapped in 1932.

Table of withdrawals[1]

Year	Quantity in service at start of year	Quantity withdrawn	Locomotive numbers	Notes
1925	10	1	1233
1926	9	1	1232
1927	8	1	1231
1928	7	3	1227, 1228, 1230
1930	4	3	1226, 1229, 1234
1935	1	1	1235

References

• Baxter, Bertram (1982). Baxter, David (ed.). British Locomotive Catalogue 1825–1923. Vol. 3A: Midland Railway and its constituent companies. Ashbourne, Derbyshire: Moorland Publishing Company. ISBN 9780903485524.
• An Illustrated Review of Midland Locomotives Volume 3 - Tank Engines by R. J. Essery & D. Jenkinson ISBN 9780906867662

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