Class Types
| GCR Class |
9J |
| LNER Class |
J11 |
| (Also known as) |
Pom-Pom (Named after the sharp bark of their exhaust which was reminiscent of the sound of the quick-firing gun of that name used in the Boer War.) |
General
| Designer |
John Robinson |
| Introduced |
1901 |
| Pre-Grouping Company |
Great Central Railway |
| Grouping Company |
London and North Eastern Railway |
| Description (1957) |
Classes J11 and J11/3. Great Central Robinson 5'1" 0-6-0's, built between 1901 and 1910, some of the class being superheated. All the class were in service until 1954, but many have been withdrawn since. Class J11/3 (rebuilt from class J11) have long travel piston valves and higher pitched boilers. Thirty-two of class J11 were so rebuilt between 1942 and 1954. |
| Wheel Arrangement |
0-6-0 |
| Number Built as J11 |
174 |
| First in Service |
09/1901 |
| Last in Service |
21/10/1962 |
| Manufacturers |
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| Orders |
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| Classification |
Southern Area 3 |
| Route Availability |
5 |
| BR Power Class |
3F |
| Engine Diagrams |
| Diagram | Details | | Section C, 1924 | Part 1. Engines with 3,250 gallon tenders. Both saturated and superheated. | | Section C, 1924 | Part 2. Engines with 4,000 gallon tenders. Both saturated and superheated. | | Section C, 1924 | Engine 16. Superheated with piston valves, 20in. cylinders and 4,000 gallon tender. | | Section C, 1924 | Engine 134. Saturated large-boilered rebuild from class J10. | | Section C, 1925 | Part 3. Engine 16 reclassified. Amended weights and front overhang reduced. | | Section C, 1926 | Engines with 3,250 gallon tenders. Became Part 1 in December 1927 (to G.C. gauge). Boiler dimensions amended December 1938 and again December 1948. Chimneys shown as 12ft. 11¾in. by December 1941, but domes remained 13ft. 2in. | | Section C, 1926 | Engines with 4,000 gallon tenders. Became Part 2 in December 1927 (to G.C. gauge). Boiler dimensions amended December 1938 and again December 1948. Chimneys shown as 12ft. 11¾in. by December 1941, but domes remained 13ft. 2in. | | Section C, 1927 | Part 4. Engines with 3,250 gallon tenders. Superheated and to L.N.E.R. 13ft, gauge. Boiler dimensions amended December 1938. | | Section C, 1927 | Part 5. Engines with 4,000 gallon tenders. Superheated and to L.N.E.R. 13ft, gauge. Boiler dimensions amended December 1938. | | 1942 | Part 3. Superheated piston valve rebuilds, both 3,250 and 4,000 gallon tenders. | | 1943 | Parts 4 & 5. Combined diagram. Boiler dimensions amended December 1948. Class parts deleted December 1952. | | 1946 | Part 2. Details of superheated engines only. Tube-plate thickness and springs altered. Boiler dimensions amended December 1948. |
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