JGR: Hokkaido Tanko Coal Mining & Railway Co / Imperial Government Railways / Japanese Government Railways / Kansai / Kiushui / Nippon Railway 2-6-0 Locomotives in Japan


Class Details by Steve Llanso of Sweat House Media

Class 11 / 7200 (Locobase 10962)

Data from []. See also DeGolyer, Volume 16, p. 115 [appears in list of specifications, but not in actual volume]; Volume 19, p. 93; and Volume 20, p. 191. Works numbers were 11203-11206 in September 1890; 12063, 12069, 12076, 12080-12081, 12083 in July 1891; 13969-13970 in March 1894; 15024-15027 in August 1896; 15073 in October 1896; 15145-15150 in December 1896; 15164-15165 in January 1897.

1896-1897 batches had their boilers pressed to 160 psi. Ran on rails weighing 45 lb/yard (22.5 kg/metre).


Class 30/7850 (Locobase 10970)

Data from []; and "JGR72850" in Locomotive Wiki at [], last accessed

12 January 2024. Works numbers were 3598-3603, 3615-3618 in 1898 and 17725-17726 in 1908 .(Dubs identified the owner as the Kwansei Railway")

The first ten of the class arrived in 1898; the last two came from the same factory after Dubs and two other builders merged assets in 1901 as the North British Locomotive Company.

From the time of their service entries, these engines --nicknamed Inazuma ("Lightning")-- served the Monji and Osaka area.-


Class 7 (Locobase 15410)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 78, p. 365. Works numbers were 58841-58843 in November 1925.

The Hokkaido Railway used 60 lb/yard (30 kg/metre) rail on an alignment that included 1 in 66 (1.66%) grades measuring one mile long (1.6 km)


Class 8 / 7170 (Locobase 9413)

Data from DeGolyer, Volume 14, p. 76. See also [] . Works numbers were 8969-8970 in December 1887.

Although imported by Horonai, these engines soon went to the Hokkaido Colliery and Railway Company and were renumbered 9-10. When legislation created the Imperial Government Railways in 1906, the HCRC was incorporated into the new system and this pair was redubbed 7170-7171.

In 1920, the pair went to the Suttsu Railways as 1-2 and served the cities of Ashikawa, Hakodate, Kutchan, and Muroran. For several more decades, the little Moguls continued to run. On 2 July 1950, one of them was wrecked in a collision and scrapped in 1951.


Class 8550 (Locobase 14406)

Data from "The Trade of Kobe and Osaka-1901," Anglo-Japanese Gazette, Volume 1, No 12 (December 1902), p. 112. Before the formation of Alco, works numbers were 5264-5272 in December 1899, 6153-6164 in January 1903. Alco-Schenectady works numbers were 27803-27814 in June 1903, 29852 in May 1904, 30500-30511 in May 1905, 38606 in October, 41314-41325 in December 1906.

American locomotives had established a good reputation operating in Japanese conditions. This order was bound for Kyushu, the most southern of the main islands.


Class 8620 (Locobase 3805)

Data from Hiroshi Takagi, both from his website []) and personal communication August 2000. His indispensable assistance is gratefully acknowledged. See also A Profile of Japanese Steam Locomotives website put up in 2007 by "Toki S." at [], last accessed 26 September 2015; and Saito Akira, "Overview of Japan's modern steam locomotives" at [], last accessed 14 October 2022. .

This engine, originally supplied by North British Locomotive Company, duplicated the boiler and other basic elements of the 6760 4-4-0, but put three driving axles under it instead of two. For about 3,000 lb more engine weight, adhesion weight jumped by about 13 short tons (11,793 kg)! This engine later saw a minor boost in boiler pressure to 185 psi (12.76 bar).

Saito Akria contended that, although their "distinguished" 60 years of service couldn't be ignored, the design reflected a pedestrian approach to locomotive design. On the other hand, Shima did modify the Krauss-Helmholz bogie (which combined the leading truck and the front driving axle in a bogie that had its pivot between the two axles). His used a "elaborate series of links to lead the locomotive smoothly even on small radius curve (sic)"; one result was a rigid wheelbase of only 10 ft (3.048 m). The design was unique to this class, however, probably because it was difficult to maintain, Saito believed.

Information from Ejii Nozawa's web site ([]) notes that these were built from 1914-1929 by Hitachi, Kawasaki, KSK, Mitsubishi, and Nippon.

Hiroshi Naito ([]) comments "Because of its prevalence, it was said that Hachi-roku (nickname of the type, eight-six in Japanese) could be seen anywhere as long as rail continued." In Formosan service, the locomotive was designated CT-150 ([])

The Japanese Railway Society's Umekoji Museum website -- [], accessed 30 November 2006 -- says they were nicknamed Hachiroku (Eight-six).


Class AG / 7700 (Locobase 11045)

Data from [] and the Japanese-language blogging site [] and []

Train loading was 284-303 tons up a 1% at 20 mph, 142-151.5 tons up 2 1/2% at 20 mph.


Class AL/E6/7950 (Locobase 10971)

Data from "Mogul Locomotive for the Imperial Railways of Japan--Rogers Locomotive Company", Railroad Gazette, Volume 27, No (9 April 1897), p. 354. See also [] and from the Japanese-language blog [] . Works numbers were 5164-5181 in 1897.

The RG report noted that this class "more nearly" conformed to "strictly American practice than most locomotive built for foreign lands." (True, perhaps, but there wasn't a mile of Cape Gauge (1,067 mm) track in the US.)


Class AQ/E7/8100 (Locobase 10972)

Data from [] and DeGolyer, Volume 21, p. 49. Works numbers were 15481-15500 in September 1897.

This class of small Moguls was rated to haul 336,000 lb (168 short tons or 150 "English tons") up a 2 1/2% grade and around15-chain curves at 18 mph (29 kph).


Class B1/7400 (Locobase 12217)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 20, .p. 192; and "JGR Class 7400" in Steam Locomotives, Locomotive Wiki at [], last accessed 19 January 2024. Works numbers were 15028-15030 in August 1896.

Locomotive Wiki notes that this Mogul trio were the first to operate on the Hokkaido on Japan's northernmost main island.When built, the HC&C laid rails weighing 45 lb/yard (22.5 kg/metre). Similar in size to many contemporary 2-6-0s in Japan, B1s first hauled freight around Asahikawa in Hokkaido's center and later shunted in Notsukeushi (now Kitami) farther east near the Pacific Ocean.

All three were retired in 1925.


Class B4/E/7350 (Locobase 10965)

Data from []; and "JGR Class 2350" in the Locomotive Wiki at [], last accessed 12 January 2024. Works numbers were 5703-5708 in 1902

When first delivered, this light Mogul sextet operated in the Asahikawa district on Japan's northernmost main island. Their proportions were oddly distorted by the use of a full-size North American cab. In later years, the JGR shunted traffic at Terniya.

The last of the class went to the scrapper in 1937.


Class C1/7800 (Locobase 10969)

Data from []; and ":JGR Class 7800" in Locomotive Wiki at [], last accessed 12 January 2024. Works numbers were 16342-16347 in 1904.

As usually seemed the case for engines delivered to Japan/s northernmost main island, these Moguls remained on Hokkaido for all of their relatively short careers. The last engine went off the roster in 1927.


Class C50 (Locobase 3822)

Data from Hiroshi Takagi, both from his website ([]) and personal communication August 2000. His indispensable assistance is gratefully acknowledged. See also A Profile of Japanese Steam Locomotives website put up in 2007 by "Toki S." at [], last accessed 27 September 2015.

The first 67 C50s repeated the principal dimensions of the 8620 class, but boosted the boiler pressure. See #3823 for the downsized follow-ons.

Information from Ejii Nozawa's web site ([]) notes that C50s were built from 1914-1929 by Hitachi, Kawasaki, KSK, Mitsubishi, and Nippon.

A direct comparison with tube & flue heating surface areas of North American and British locomotives requires adding approximately 6-10% to the figures shown.


Class C50/2 (Locobase 3823)

Data from Hiroshi Takagi, both from his website ([]) and personal communication August 2000. His indispensable assistance is gratefully acknowledged. See also A Profile of Japanese Steam Locomotives website put up in 2007 by "Toki S." at [], last accessed 27 September 2015.

These were the last of the passenger Moguls, which rolled on 1,600 mm drivers. The need for more power and speed led the JNR to favor a 4-6-2 (Pacific) arrangement for his

Because the measurements above represent the fire side of tubes and flues, a direct comparison with tube & flue heating surface areas of North American and British locomotives requires adding approximately 6-10% to the figures shown.

Information from Ejii Nozawa's web site ([]) notes that C50s were built from 1914-1929 by Hitachi, Kawasaki, KSK, Mitsubishi, and Nippon.


Class C56 Highland Pony (Locobase 3827)

Data from Hiroshi Takagi, both from his website ([]) and personal communication August 2000. His indispensable assistance is gratefully acknowledged. See also A Profile of Japanese Steam Locomotives website put up in 2007 by "Toki S." at [], last accessed 27 September 2015.

Because the measurements above represent the fire side of tubes and flues, a direct comparison with tube & flue heating surface areas of North American and British locomotives requires adding approximately 6-10% to the figures shown.

Information from Ejii Nozawa's web site ([]) notes that these were built from 1914-1929 by Hitachi, Kawasaki, KSK, Mitsubishi, and Nippon.

The C56 is the Mogul variant of the C12/C56 common design. All the principal dimensions are identical. The additional name "Highland Pony" comes from a catalogue of model engines at [] . Locobase wasn't sure of the origin of the name, but the design's low drivers and small size suggest a mountain workhorse.

According to the Thai Railway website's historical pages -- [], accessed 8 September 2005 -- the C56 engines "...were very popular for both driver crews and maintenance staffs alike. The only catch is due to the limited size of water reserve (10 cubic meters) and small tender necessitates water stops and wood resupply en route."


Class N3/4//7750 (Locobase 10968)

Data from []; and "JGR Class 7750" in Steam Locomotives, Locomotive Wiki at [], last accessed 16 January 2024. Works numbers were 4656-4665 in 1893.

It's not clear to Locobase if these Mogule cross-compounds shared all of the specifications shown in Locobase 20678. The grate offered less area.

Locobase hasn't found a report of the N3/4's performance. The class served Tohoku and Tokaido Lines in northern Honshu at first and later in a region north of Tohoku up to the time the JGR reitred the class in 1924.

Unlike many other classes of that vintage, all of the class wound up on the Karafuto Prefectural Railway north of Hokkaido on South Sakhalin Island chain.There they ran on the K PR's West Line. In 1943, the class rejoined the JGR after the latter took over the KPR. They were soon discarded.

When the Karafuto Prefectural Railway was acquired by the JGR, seven locomotives returned to JGR ownership but all were retired by 1945.


Class V and W/E2 and E3/7450, 7600 (Locobase 11041)

Data from [] and the Japanese-language blogging site [] and []; and "JGR Class 4750" in Steam Locomotive, Locomotive Wiki at [], last accessed 16 January 2024. Works numbers were 3134-3137 in 1889.

Train loading for these Moguls was 284-303 tons up a 1% at 20 mph (32 kph), 142-151.5 tons up 2 1/2% at 20 mph. At first, the quartet served the Tokaido line around old capital of Kyoto and Otsu.

To increase their adhesive weight, Ktsons mounted side water tanks extending forward from the cab and over the last two driving axles. Unusually, each water tank's lower half was cut away from just behind the middle driver to the front end of the tank, which lay over the back half of the lead driver.

In their later days, they shunted cars at Umekoji until the JGR retired them in 1924.

)Note: Nippon imported six very similar 2-6-0s from Nasmyth Wilson in the same year (works numbers were 369-374 ) as the W class. These also used side tanks for adhesion, but without the forward-half cut outs. Boiler pressure was set at 160 psi (11 bar) and total heating surface area came to 992 sq ft (90.2 sq m).

Ws served the Tohuku line and even worked in Manchuria for a while. Like the 7450s, these were retired in the 1920s, the last leaving in 1922.)

JGR's classification system placed them in Class 7600 in 1909.


Class X/E3/ 8150 (Locobase 5414)

Data from "A Japanese Mogul Locomotive," Railroad and Engineering Journal, Volume 65, No 4 (April 1891), p. 167. See also DeGolyer, Volume 16, p.8. Works numbers were 10743-10744 in March 1890 and 13756-13758, 13763 in September 1893.

The article notes that the engine was tested on the 15-mile Gotembu-Numadzu section, which had an average 1% grade (and individual grades between 1 2/3% and 2 1/2%), and total elevation change of 1,500 ft. Trailing loads were planned to be 316 tons up a 1% grade at 20 mph and 158 tons up a 2 1/2% grade at 20 mph.


Class unknown (Locobase 10296)

Data from "British Locomotives in Japan," The Locomotive Magazine, Vol VIII (21 March 1903), p. 199. Boiler pressure is an estimate.

This tank engine trailed a tender as well, possibly because the low-calorie coal could not be stored in enough quantity in a tank engine's coal bunker. This Mogul tank may have used the same boiler, but not the same grate as the 4-4-0 delivered at the same time (see Locobase 10295).


Class unknown (Locobase 20678)

Data from "Six Wheels Coupled Tender Engines: Japanese State Railways", Railway Engineer, Volume 18, No 5 (May 1897), pp. 134-136. Works numbers were 3585-3896 in 1894.

Imperial Government Railways motive power consultant F H Trevithick played a big role in Japan's acquistion of modern locomotives. These engines were designed to haul about 130 tons (118.2 metric tons), which translated to seven bogie carriages or sixteen two-axle carriages.

In addition to the tender's tankage, the locomotive carried two 450 Imperial gallon (540 US gallons or 2,044 litre) tanks, generating description as "tender-tank", The engines burned low-calorie "rather soft and smoky" coal and used rape-seed oil for lubrication, which RE noted "in the summer is too thin and in the winter too thick."

Trevithick mentioned ten more "similar engines" were built by Neilson & Company for the Nippon Railway. See Locobase 10698 for the Neilson cross-compounds delivered in 1893.

Principal Dimensions by Steve Llanso of Sweat House Media

Class11 / 720030/785078 / 71708550
Locobase ID10962 10970 15410 9413 14406
RailroadHokkaido Tanko Coal Mining & Railway Co (JGR)Kansai (JGR)Hokkaido Tanko Coal Mining & Railway Co (JGR)Hokkaido Tanko Coal Mining & Railway Co (JGR)Kiushui (JGR)
CountryJapanJapanJapanJapanJapan
Whyte2-6-02-6-02-6-02-6-02-6-0
Number in Class25123262
Road Numbers7200-722430-39/7850-78617-9 / 7225-72278-9 / 9-10154-165, 191-202
Gauge3'6"3'6"3'6"3'6"3'6"
Number Built25123262
BuilderBurnham, Parry, Williams & CoDubs & CoBaldwinBurnham, Parry, Williams & CoSchenectady
Year18901898192618871899
Valve GearStephensonStephensonWalschaertStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.6612.50 / 3.8111.50 / 3.5112 / 3.6611.92 / 3.63
Engine Wheelbase (ft / m)17.68 / 5.3920 / 6.1018.83 / 5.7418.33 / 5.5919.42 / 5.92
Ratio of driving wheelbase to overall engine wheelbase 0.68 0.62 0.61 0.65 0.61
Overall Wheelbase (engine & tender) (ft / m)37.42 / 11.4138.50 / 11.7344.50 / 13.5635 / 10.67
Axle Loading (Maximum Weight per Axle) (lbs / kg)17,020 / 772027,558 / 12,50017,130 / 7770
Weight on Drivers (lbs / kg)47,708 / 21,64080,601 / 36,56075,000 / 34,01944,357 / 20,12078,000 / 35,380
Engine Weight (lbs / kg)57,915 / 26,27091,867 / 41,67080,000 / 36,28753,638 / 24,33091,500 / 41,504
Tender Loaded Weight (lbs / kg)32,827 / 14,89051,346 / 23,29057,500 / 26,08234,039 / 15,44050,820 / 23,052
Total Engine and Tender Weight (lbs / kg)90,742 / 41,160143,213 / 64,960137,500 / 62,36987,677 / 39,770142,320 / 64,556
Tender Water Capacity (gals / ML)2600 / 9.851114 / 4.222433 / 9.22
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)5 / 5 2.10 / 2 2.50 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)27 / 13.5045 / 22.5042 / 2125 / 12.5043 / 21.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42.10 / 106949.20 / 125048 / 121940 / 101654 / 1372
Boiler Pressure (psi / kPa)140 / 9.70184 / 12.70170 / 11.70130 / 9180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)14" x 18" / 356x45717" x 22" / 432x55917" x 22" / 432x55914" x 18" / 356x45717" x 24" / 432x610
Tractive Effort (lbs / kg)9972 / 4523.2320,211 / 9167.5719,140 / 8681.779746 / 4420.7219,652 / 8914.01
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.78 3.99 3.92 4.55 3.97
Heating Ability
Tubes (number - dia) (in / mm)161 - 1.75" / 44176 - 2" / 51160 - 1.772" / 45190 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.25 / 2.5110.50 / 3.20 8.25 / 2.5111.08 / 3.38
Firebox Area (sq ft / m2)102 / 9.4865.60 / 6.09105.67 / 9.82
Grate Area (sq ft / m2)11.10 / 1.0316.80 / 1.5611.41 / 1.0616.86 / 1.57
Evaporative Heating Surface (sq ft / m2)1024 / 95.131062 / 98.66664 / 61.691197 / 111.20
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1024 / 95.131062 / 98.66664 / 61.691197 / 111.20
Evaporative Heating Surface/Cylinder Volume177.18183.75207.04189.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1554285614833035
Same as above plus superheater percentage1554285614833035
Same as above but substitute firebox area for grate area17,340852819,021
Power L1369926814433
Power MT326.20399.75375.89

Principal Dimensions by Steve Llanso of Sweat House Media

Class8620AG / 7700AL/E6/7950AQ/E7/8100B1/7400
Locobase ID3805 11045 10971 10972 12217
RailroadImperial Government Railways (JGR)Imperial Government Railways (JGR)Imperial Government Railways (JGR)Imperial Government Railways (JGR)Hokkaido Tanko Coal Mining & Railway Co (JGR)
CountryJapanJapanJapanJapanJapan
Whyte2-6-02-6-02-6-02-6-02-6-0
Number in Class7321218203
Road Numbers148-159187-204 / 7950-7967314-333/272-291 /8100-81191-3/ 7400-7402
Gauge3'6"3'6"3'6"3'6"3'6"
Number Built7321218203
BuilderseveralBeyer, PeacockRogersBurnham, Williams & CoBurnham, Williams & Co
Year19141884189718971896
Valve GearWalschaertStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)15 / 4.1912.50 / 3.8111.50 / 3.5112 / 3.6613 / 3.96
Engine Wheelbase (ft / m) / 7.0120 / 6.1018.67 / 5.6919.33 / 5.8919.50 / 5.94
Ratio of driving wheelbase to overall engine wheelbase 0.62 0.62 0.62 0.67
Overall Wheelbase (engine & tender) (ft / m) / 14.3140.06 / 12.2140.21 / 12.26
Axle Loading (Maximum Weight per Axle) (lbs / kg)29,211 / 13,25026,096 / 11,83727,778 / 12,60025,618 / 11,620
Weight on Drivers (lbs / kg)87,634 / 39,75075,600 / 34,29277,294 / 35,06071,981 / 32,65064,000 / 29,030
Engine Weight (lbs / kg)103,066 / 46,75087,360 / 39,62688,053 / 39,94083,401 / 37,83075,000 / 34,019
Tender Loaded Weight (lbs / kg) / 34,70055,887 / 25,35054,873 / 24,890
Total Engine and Tender Weight (lbs / kg)143,940 / 65,290138,274 / 62,720
Tender Water Capacity (gals / ML)2400 / 9.0926001800 / 6.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.50
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.5042 / 2143 / 21.5040 / 2036 / 18
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 160048 / 121948 / 121948 / 121942 / 1067
Boiler Pressure (psi / kPa)180 / 12.40160 / 11165 / 11.40160 / 11160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)18.5" x 24" / 470x61017" x 22" / 432x55917" x 22" / 432x55917" x 24" / 432x61016" x 18" / 406x457
Tractive Effort (lbs / kg)19,948 / 9048.2718,014 / 8171.0218,577 / 8426.4019,652 / 8914.0114,921 / 6768.06
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.39 4.20 4.16 3.66 4.29
Heating Ability
Tubes (number - dia) (in / mm)91 - 1.75" / 44173 - 2" / 51220 - 1.75" / 44181 - 1.75" / 44
Flues (number - dia) (in / mm)18 - 5" / 127
Flue/Tube length (ft / m)13 / 3.9610.25 / 3.1210.52 / 3.2110.50 / 3.20
Firebox Area (sq ft / m2)109 / 10.13103 / 9.5779.50 / 7.39
Grate Area (sq ft / m2)17.54 / 1.6317 / 1.5815 / 1.3918 / 1.6715.90 / 1.48
Evaporative Heating Surface (sq ft / m2)956 / 88.81991 / 92.101031 / 95.82943 / 87.64
Superheating Surface (sq ft / m2)296 / 27.50
Combined Heating Surface (sq ft / m2)1252 / 116.31991 / 92.101031 / 95.82943 / 87.64
Evaporative Heating Surface/Cylinder Volume128.03171.47178.39225.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation31572720247528802544
Same as above plus superheater percentage39152720247528802544
Same as above but substitute firebox area for grate area24,32916,99512,720
Power L110,54335313584
Power MT795.69302.14370.38

Principal Dimensions by Steve Llanso of Sweat House Media

ClassB4/E/7350C1/7800C50C50/2C56 Highland Pony
Locobase ID10965 10969 3822 3823 3827
RailroadHokkaido Tanko Coal Mining & Railway Co (JGR)Hokkaido Tanko Coal Mining & Railway Co (JGR)Japanese Government Railways (JGR)Japanese Government Railways (JGR)Japanese Government Railways (JGR)
CountryJapanJapanJapanJapanJapan
Whyte2-6-02-6-02-6-02-6-02-6-0
Number in Class686787160
Road Numbers17-22/7350-735512-17/7800-7807C50 1-C50 167C50 68-C50 154C56 1 - C56 160
Gauge3'6"3'6"3'6"3'6"3'6"
Number Built686787160
BuilderRogersNorth Britishseveralseveralseveral
Year19021904192919291935
Valve GearStephensonStephensonWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.75 / 3.2812.50 / 3.8113.75 / 4.1913.75 / 4.1912.47 / 3.80
Engine Wheelbase (ft / m)18 / 5.4920 / 6.10 / 7.1523.46 / 7.1520.51 / 6.25
Ratio of driving wheelbase to overall engine wheelbase 0.60 0.62 0.59 0.61
Overall Wheelbase (engine & tender) (ft / m)38 / 11.5841 / 12.50 / 16.2653.35 / 16.2639.37 / 12
Axle Loading (Maximum Weight per Axle) (lbs / kg)24,295 / 11,02028,440 / 12,90032,695 / 14,83031,857 / 14,45023,347 / 10,590
Weight on Drivers (lbs / kg)67,990 / 30,84080,204 / 36,38098,106 / 44,50095,570 / 43,35070,019 / 31,760
Engine Weight (lbs / kg)79,102 / 35,88091,955 / 41,710116,845 / 53,000116,404 / 52,80082,960 / 37,630
Tender Loaded Weight (lbs / kg)51,742 / 23,47064,551 / 29,28076,941 / 34,90061,509 / 27,900
Total Engine and Tender Weight (lbs / kg)130,844 / 59,350156,506 / 70,990193,345 / 87,700144,469 / 65,530
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)38 / 1945 / 22.5055 / 27.5053 / 26.5039 / 19.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42.10 / 106948 / 122063 / 160063 / 160055 / 1397
Boiler Pressure (psi / kPa)164 / 11.30159.50 / 11200.20 / 13.80200.20 / 13.80200.20 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)15" x 18" / 381x45717.01" x 22.01" / 432x55918.5" x 24.02" / 470x61018.5" x 24.02" / 470x61015.75" x 24.02" / 400x610
Tractive Effort (lbs / kg)13,410 / 6082.6817,987 / 8158.7822,205 / 10072.0322,205 / 10072.0318,435 / 8361.99
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.07 4.46 4.42 4.30 3.80
Heating Ability
Tubes (number - dia) (in / mm)93 - 1.732" / 4493 - 1.575" / 4068 - 1.575" / 40
Flues (number - dia) (in / mm)18 - 5" / 12718 - 4.685" / 11916 - 4.685" / 119
Flue/Tube length (ft / m)12.99 / 3.9612.99 / 3.9610.50 / 3.20
Firebox Area (sq ft / m2)102.22 / 9.50102.26 / 9.5089.34 / 8.30
Grate Area (sq ft / m2)16.15 / 1.5017.32 / 1.6117.22 / 1.6013.99 / 1.30
Evaporative Heating Surface (sq ft / m2)962 / 89.37990 / 92958 / 89885 / 82.20586 / 54.40
Superheating Surface (sq ft / m2)310 / 28.80310 / 28.80213 / 19.80
Combined Heating Surface (sq ft / m2)962 / 89.37990 / 921268 / 117.801195 / 111799 / 74.20
Evaporative Heating Surface/Cylinder Volume261.30171.01128.20118.43108.19
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2576346734472801
Same as above plus superheater percentage2576430043443557
Same as above but substitute firebox area for grate area25,37625,79522,715
Power L111,98111,7769994
Power MT807.70814.95944.01

Principal Dimensions by Steve Llanso of Sweat House Media

ClassN3/4//7750V and W/E2 and E3/7450, 7600X/E3/ 8150unknownunknown
Locobase ID10968 11041 5414 10296 20678
RailroadNippon Railway (JGR)Imperial Government Railways (JGR)Imperial Government Railways (JGR)Imperial Government Railways (JGR)Imperial Government Railways (JGR)
CountryJapanJapanJapanJapanJapan
Whyte2-6-02-6-02-6-02-6-0T2-6-0T
Number in Class104612
Road Numbers77-86/7750-7759130, 132, 134, 136/94-97/7450-7453150, 152, 222-225 / 8150-8155
Gauge3'6"3'6"3'6"3'6"3'6"
Number Built104612
BuilderNeilson & CoKitson & CoBurnham, Parry, Williams & CoDubs & CoBeyer, Peacock
Year18931889189019001893
Valve GearStephensonStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.50 / 3.8112.50 / 3.8112 / 3.6612.50 / 3.81
Engine Wheelbase (ft / m)20 / 6.1020 / 6.1019.67 / 620 / 6.10
Ratio of driving wheelbase to overall engine wheelbase 0.62 0.62 0.61 0.62
Overall Wheelbase (engine & tender) (ft / m)39.01 / 11.8938.50 / 11.7347 / 14.33
Axle Loading (Maximum Weight per Axle) (lbs / kg)27,470 / 12,46025,760 / 11,68526,320 / 11,93926,320 / 11,939
Weight on Drivers (lbs / kg)82,056 / 37,22077,280 / 35,05475,152 / 34,08875,824 / 34,393
Engine Weight (lbs / kg)91,514 / 41,51086,520 / 39,24588,144 / 39,98190,048 / 40,84587,584 / 39,727
Tender Loaded Weight (lbs / kg)49,560 / 22,48047,040 / 21,33748,384 / 21,94746,816 / 21,235
Total Engine and Tender Weight (lbs / kg)141,074 / 63,990135,184 / 61,318138,432 / 62,792134,400 / 60,962
Tender Water Capacity (gals / ML)2400 / 9.092600 / 9.852400 / 9.092400 / 9.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.30 / 3 3.40 / 3 3.80 / 4 5.50 / 5
Minimum weight of rail (calculated) (lb/yd / kg/m)46 / 2343 / 21.5042 / 2142 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 122045 / 114348 / 121948 / 121948 / 1219
Boiler Pressure (psi / kPa)179.80 / 12.40140 / 9.70140 / 9.70140 / 9.70160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)17.01" x 22.01" / 432x559 (1)16" x 22" / 406x55918" x 22" / 457x55917" x 22" / 432x55917" x 22" / 432x559
Low Pressure Cylinders (dia x stroke) (in / mm)25" x 22.01" / 635x559 (1)
Tractive Effort (lbs / kg)13,860 / 6286.8014,894 / 6755.8117,672 / 8015.8915,763 / 7149.9918,014 / 8171.02
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.92 5.19 4.25 4.21
Heating Ability
Tubes (number - dia) (in / mm)200 - 2" / 51178 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.75 / 3.2811.08 / 3.38
Firebox Area (sq ft / m2)97109 / 10.1390 / 8.36
Grate Area (sq ft / m2)16.15 / 1.5016 / 1.4918.25 / 1.7016.60 / 1.5417 / 1.58
Evaporative Heating Surface (sq ft / m2)990 / 92991 / 92.071231 / 114.361000 / 92.94991 / 92.07
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)990 / 92991 / 92.071231 / 114.361000 / 92.94991 / 92.07
Evaporative Heating Surface/Cylinder Volume342.03193.57189.98173.02171.47
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation29042240255523242720
Same as above plus superheater percentage29042240255523242720
Same as above but substitute firebox area for grate area17,44115,26014,400
Power L1339330703191
Power MT273.48270.18278.34

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