T.W.Worsdell introduced the 2-4-2T type to the Great Eastern Railway (GER) in 1884 from his previous employer, the London & North Western Railway (LNWR). These GER Class M15 (LNER F4) locomotives were designed for working branch and suburban passenger services.

These read - "LNER - during the war of 1939-1945 this locomotive was armoured and hauled defence trains on coast lines". [4] Thirty-seven F4s and all of the F5s, including 7218 and 7219 (ex-7789 and 7790), passed into British Railways (BR) ownership in 1948. Their BR numbers were: Class F4: 67151-67187.

The NER Class F (LNER Class D22) was a class of 4-4-0 steam locomotives of the North Eastern Railway. It was designed by Thomas William Worsdell and introduced in 1887.

The LNER 2-4-2 Locomotives. The 2-4-2T was adopted by many companies for local passenger work (and in at least one case for semi-fast duties). The LNER inherited 341 at Grouping (1923), and did not build any of its own. Due to the large numbers inherited from the Great Eastern Railway (GER), they outnumbered all other four-coupled tank designs.

The LNER class F5 engines were rebuilt from 1911 onwards from F4 class locomotives built at Stratford between 1903 and 1909. These engines had higher pressure boilers and as with the class F3 tanks there was a lot of variation in the boiler mountings (chimneys, domes and …

The Great Eastern Railway M15r Class (latterly LNER Class F5) 2-4-2T was designed by James Holden and was a improvement upon members of the earlier M15 (LNER F4) Class 2-4-2T introduced by Thomas William Worsdell. All were built at the Great Eastern Railway’s Stratford Works in East London from 1884 to 1909.

After the grouping of 1923 the M15/M15R became LNER class F4 and F5 respectively, although two of the M15R locomotives had cabs with side windows like the larger G69 class and were designated F6 7789 & 7790 (renumbered 7218 & 7219 in 1946).

The Holden F5 Steam Locomotive Trust, formed in 2003, is constructing a replica of the Great Eastern Railway’s M15r (latterly LNER F5) Class of locomotives, designed by James Holden and an improvement upon members of the earlier M15 (LNER F4) Class introduced by Thomas William Worsdell.

One of these designs was for the 2-4-2T Class A (LNER F8) which was intended to replace the "Bogie Tank Passenger" G6 0-4-4T as the current NER passenger tank locomotive. The F8 had radial tanks, and was really a slightly larger version of the F4 s which he had previously designed for the Great Eastern Railway (GER).

2012年7月15日 · British Railways finally sorted out that mess. Frankly, because of the similarities they could have all been classified F4 with subclasses: M15 > F4, M15R > F4/1, M15R with G69 cabs F4/2 and G69 F4/3. The J67/68/69 classification was even more of a pickle; two distinct classes, the R24R and S56 were lumped together under J69.