The reference for locomotives and railcars
Tank Locomotives 4-2-2T and 4-2-4T[Inhalt]
UIC Classification 2'A1 t and 2'A2' t
Bristol & Exeter Pearson 9 feet 4-2-4T
Great Britain | 1853 | 8 produced
No. 44
No. 44
Stadtarchiv Maynz / BPSF 9849 A

The broad gauge Bristol & Exeter Railway took over the “Flying Dutchman”, which started from London-Paddington, on the last section between Bristol and Exeter. To accommodate this fastest train in the world, eight tank locomotives with a driving wheel diameter of nine feet or 2,743 mm were ordered from Rothwell & Co. These were the largest wheels ever found on a commercially used locomotive.

There was a bogie at each end of the locomotives, while the driving wheels had no flanges. The load on the bogies was lower than that on the driving axle. Another feature was the outside frame, which ran from front to back and in which the driving axle was also mounted. They often reached speeds of around 80 mph (129 km/h), with the highest recorded speed on a slight decent reaching 81.8 mph

After the rebuild to 8 ft 10 in
After the rebuild to 8 ft 10 in
Locomotive Magazine, October 1898

After a derailment in 1876, the remaining seven locomotives were rebuilt. They received driving wheels with a diameter of only eight feet and ten inches, which now had flanges. In addition, the outside frame was eliminated and there was now a longer overall wheelbase. Furthermore, the cylinders were now larger and, the larger boiler above all had a larger grate because it now burned coal instead of coke. Three were even converted into tender locomotives with a 4-2-2 wheel arrangement.

Variantas builtrebuilt 8 ft 10 in
ManufacturerRothwell & Co.Swindon
Axle config4-2-4T (Huntington) 
Gauge7 ft 0 1/4 in (GWR broad gauge)
Dimensions and Weights
Length33 ft 6 in
Wheelbase24 ft 10 in25 ft 6 in
Fixed wheelbase5 ft 9 in5 ft 6 in
Service weight94,080 lbs111,328 lbs
Adhesive weight41,440 lbs
Axle load41,440 lbs
Water capacity1,717 us gal
Fuel capacity4,480 lbs (coal)
Power sourcesteam
Estimated power350 hp (261 kW)400 hp (298 kW)
Optimal speed36 mph34 mph
Top speed80 mph
Starting effort6,171 lbf7,483 lbf
Power Plant
Driver diameter108 in106 in
Boiler pressure120 psi
Expansion typesimple
Cylinderstwo, 16 1/2 x 24 intwo, 18 x 24 in
Grate area125 sq ft23.1 sq ft
Firebox area146 sq ft
Tube heating area1,089 sq ft
Evaporative heating area1,075 sq ft1,235 sq ft
Total heating area1,075 sq ft1,235 sq ft
Calculated Values
steam locomotive
last changed: 01/2024
Central Pacific No. 3 “C. P. Huntington”
United States | 1863 | only one produced
“C.P. Huntington” in the California State Railroad Museum
“C.P. Huntington” in the California State Railroad Museum
Joe Ross

During the American Civil War, when all the major locomotive works were busy producing for the war factions, the Central Pacific was in search of locomotives for its eastward expansion. Since no powerful tender locomotives could be found, the two small 4-2-4T tank locomotives with the names “C.P. Huntington” and “T.D. Judah” were purchased from Cooke. The former was named after Collis Potter Huntington, who was one of the “Big Four” and thus played a key role in the realization of the First Transcontinental Railroad.

After the procurement of more powerful locomotives, the No. 3 quickly lost importance due to its low power and small supplies and was used in front of construction trains. After being taken over by the Southern Pacific, it was assigned number 1 because of her importance and took on lighter duties in northern California. It was exhibited from 1888, but ended up in storage as early as 1891, only to be converted into a mobile weed incinerator ten years later.

A new life for the locomotive began in 1910 when it was restored to working order. In the decades that followed, it participated in many parades and exhibitions, including the opening of Union Station in Los Angeles. In 1964 it was sold to the State of California, which has exhibited it at the California State Railroad Museum since 1981 after two other locations in Sacramento. Since 1960, more than 400 scaled-down replicas have been manufactured in three feet gauge, which have been available with different types of drive for several years.

Axle config4-2-4T (Huntington) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase21 ft 2 in
Service weight43,500 lbs
Adhesive weight15,980 lbs
Axle load15,980 lbs
Water capacity300 us gal
Fuel capacity840 lbs (wood)
Power sourcesteam
Estimated power125 hp (93 kW)
Optimal speed22 mph
Starting effort3,571 lbf
Power Plant
Driver diameter54 in
Boiler pressure125 psi
Expansion typesimple
Cylinderstwo, 11 x 15 in
Grate area9.4 sq ft
Firebox area58 sq ft
Tube heating area361 sq ft
Evaporative heating area419 sq ft
Total heating area419 sq ft
Calculated Values
steam locomotive
last changed: 06/2022

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