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Tank Locomotives 4-6-2T “Pacific”[Inhalt]
UIC Classification 2'C1'
Great Central class 9N
London & North Eastern class A5
Great Britain | 1911 | 44 produced
Locomotive Magazine, June 1923

Robinson developed these heavy GCR class 9N tank locomotives for fast suburban traffic. With a driving wheel diameter of 5 feet and 7 inches or 1,702 mm and three coupled axles, they were also able to achieve good acceleration. Otherwise they were state-of-the-art with piston valves and superheaters. Between 1910 and 1917, 21 locomotives were built in GCR's Gorton works.

The second production lot was delayed until after the First World War. In 1923, ten more were built with adjustments by Gresley, including a smaller heating surface. These were now being built by Hawthorn, Leslie & Co. as were the next 13 in 1925 and 1926.

The previous class 9N became the A5 at the LNER. In order to be able to distinguish the first and second series, these became the A5/1 and A5/2. British Railways took over 43 of 44 locomotives. The rest were retired between 1957 and 1960.

VariantA5/1A5/2
General
Built1911-19171923-1926
ManufacturerGortonHawthorn, Leslie & Co.
Axle config4-6-2T (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length42 ft 11 7/8 in
Wheelbase32 ft 9 in
Fixed wheelbase13 ft
Service weight185,920 lbs192,640 lbs
Adhesive weight120,960 lbs
Axle load41,840 lbs
Water capacity2,738 us gal
Fuel capacity9,296 lbs (coal)
Power
Power sourcesteam
Estimated power975 hp (727 kW)925 hp (690 kW)
Optimal speed29 mph28 mph
Starting effort21,110 lbf
Power Plant
Driver diameter67 in
Boiler pressure160 psi
Expansion typesimple
Cylinderstwo, 20 x 26 in
Boiler
Grate area21 sq ft
Firebox area141 sq ft141.3 sq ft
Tube heating area1,294 sq ft1,138.7 sq ft
Evaporative heating area1,435 sq ft1,280 sq ft
Superheater area214 sq ft178 sq ft
Total heating area1,649 sq ft1,458 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
John George Robinson
Herbert Nigel Gresley
last changed: 03/2023
London & North Western Prince of Wales Tank class ( class 2665 or “5ft 6in Tank (Superheated)”)
London, Midland & Scottish class 4P
Great Britain | 1910 | 47 produced
No. 2273
No. 2273

The Prince of Wales Tanks were 47 4-6-2T tank locomotives which Charles Bowen Cooke had built in Crewe between 1910 and 1916 for the LNWR. As their name suggests, they were referred to as tank versions of the Prince of Wales Class. However, they were more closely related to the Precursor Tanks, which had one less driving axle. They were also known as class 2665 after their running numbers and also as “5ft 6in Tank (Superheated)”.

Twelve locomotives were built without superheaters, but were rebuilt after a short time. The area of operation included, among others, suburban trains from London-Euston. Since the axle load was lower than that of the Precursor Tanks, they could be used more freely. This was the case, for example, on a 120-mile route in Wales. They all came to the LMS in 1923 and were decommissioned there between 1935 and 1941. Their successors were the 2-6-4T tank locomotives designed by Fowler and Stanier.

Variantsaturatedsuperheated
General
Built1910-1916
ManufacturerCrewe
Axle config4-6-2T (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase33 ft 9 in
Fixed wheelbase14 ft
Service weight174,720 lbs172,480 lbs
Adhesive weight99,680 lbs98,560 lbs
Axle load36,960 lbs
Water capacity2,042 us gal
Fuel capacity6,720 lbs (coal)
Power
Power sourcesteam
Estimated power750 hp (559 kW)1,050 hp (783 kW)
Optimal speed25 mph30 mph
Starting effort19,323 lbf22,584 lbf
Power Plant
Driver diameter68.5 in
Boiler pressure175 psi
Expansion typesimple
Cylinderstwo, 18 1/2 x 26 intwo, 20 x 26 in
Boiler
Grate area23.9 sq ft
Firebox area137 sq ft138 sq ft
Tube heating area1,338 sq ft1,192 sq ft
Evaporative heating area1,475 sq ft1,330 sq ft
Superheater area248 sq ft
Total heating area1,475 sq ft1,578 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
Charles John Bowen Cooke
last changed: 04/2024
London & North Eastern class A8
Great Britain | 1931 | 45 produced
British Railways No. 69873 in June 1954 at Middlesbrough depot
British Railways No. 69873 in June 1954 at Middlesbrough depot
Ben Brooksbank / Ex-North Eastern Raven Class A8 4-6-2T at Middlesbrough Locomotive Depot

The class A8 of the LNER was created when Gresley rebuilt all 45 locomotives of the North Eastern class D, the later LNER class H1 that had been designed by Vincent Raven. To make this 4-4-4T better suited for heavy suburban traffic and long distance coastal trains, he swapped the two-axle trailing bogie against a single axle and added another driving axle, making it a 4-6-2T.

In this process, also the boiler was revised. It was now operated with 175 instead of 160 psi and had a Robinson superheater instead of the Schmidt type. After all had been rebuilt between 1931 and 1936, they also replaced the 0-4-4T class G5. The introduction of the DMUs in the 1950s was the decline of the A8. They were withdrawn between 1957 and 1960.

General
Built1931-1936
ManufacturerGateshead
Axle config4-6-2T (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length42 ft 6 in
Wheelbase33 ft 3 in
Service weight194,432 lbs
Adhesive weight119,056 lbs
Axle load39,872 lbs
Water capacity2,402 us gal
Fuel capacity8,960 lbs (coal)
Power
Power sourcesteam
Estimated power975 hp (727 kW)
Optimal speed27 mph
Starting effort22,890 lbf
Power Plant
Driver diameter69 in
Boiler pressure175 psi
Expansion typesimple
Cylindersthree, 16 1/2 x 26 in
Boiler
Grate area23 sq ft
Firebox area124 sq ft
Tube heating area961 sq ft
Evaporative heating area1,085 sq ft
Superheater area191 sq ft
Total heating area1,276 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
Sir Vincent Litchfield Raven
Herbert Nigel Gresley
last changed: 07/2024
Austrian Southern Railway and Imperial-Royal State Railways class 629
Czechoslovak State Railways class 354.1, Polish State Railways OKm11, German Reichsbahn class 772-3 and Austrian Federal Railways class 77
Austria-Hungary | 1913 | 329 produced
629.01 in May 2007 at the Köflacher station in Graz
629.01 in May 2007 at the Köflacher station in Graz
Moschitz

Based on the class 229 2-6-2T tank locomotive of the Südbahn and kkStB, Ernst Prossy developed the class 629 for the Südbahn. In order to be able to increase power while maintaining the axle and meter loads, a leading bogie was used. With an unchanged driving wheel diameter of 1,614 mm (63.5 inches), they were suitable for passenger and light express trains. Approval was initially granted for 85 km/h and later increased to 90 km/h, and even 110 km/h was achieved on test runs.

After the Südbahn had received 15, Gölsdorf also adopted the design with small changes for the kkStB and had 25 more built. Larger numbers were only created after the First World War, when the BBÖ, the ČSD and the PKP had more machines built. The ČSD in particular ultimately made it to a total of 234 with its class 354.1 locomotives built by Škoda. These were characterized by two steam domes with a connecting pipe.

Variant1913 variant1927 variant
General
Built1913-19221927-1928
ManufacturerStEG, Wiener Neustadt, Krauss Linz, Škoda
Axle config4-6-2T (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length43 ft 9 3/8 in
Wheelbase31 ft 5 9/16 in
Fixed wheelbase11 ft 9 3/4 in
Service weight176,811 lbs184,747 lbs
Adhesive weight95,240 lbs99,208 lbs
Axle load31,747 lbs33,069 lbs
Water capacity3,170 us gal
Fuel capacity6,614 lbs (coal)
Power
Power sourcesteam
Indicated power1,113 hp (830 kW)
Optimal speed28 mph
Top speed56 mph
Starting effort24,997 lbf
Power Plant
Driver diameter63.5 in
Boiler pressure188 psi
Expansion typesimple
Cylinderstwo, 18 11/16 x 28 3/8 in
Boiler
Grate area29.1 sq ft
Firebox area131.3 sq ft
Tube heating area1,395.5 sq ft
Evaporative heating area1,526.9 sq ft
Superheater area363.3 sq ft
Total heating area1,890.1 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
last changed: 02/2024
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