JGR Class 7170

The Japanese Class 7170 steam locomotive was among the first trains to be used in Hokkaido, and was utilized alongside the JNR Class 7100 on the Horonai Railway.

The two tender locomotives that were to become the Class 7170 were purchased from the American Baldwin Locomotive Works in 1889, and were included into the numbering sequence of the six 7100 trains as numbers 7 and 8. Soon afterwards, the Horonai Railway came to be controlled by Hokuyūsha company president Murata Tsutsumi, who renamed them "First Murata" and "Second Murata" (dai-ichi and dai-ni Murata). The two were later sold off by the Meiji government, which privatized (sold) a great many government endeavors.

History

Though originally numbered 8 & 9 upon their import from the United States, the two locomotives were re-numbered 9 & 10 upon their sale by the government-controlled Horonai Railway to the Hokkaido Colliery and Railway Company in 1889. The 1906 Railway Nationalization Act then incorporated the Hokkaido Colliery and Railway Company into the Japanese Government Railways. Three years later, legislation would formalize and standardize the numbering, establishing the Class 7170 as consisting of these two locomotives, dubbed 7170 and 7171. At this time, the chimneys were altered, and the forward sections of the steam rooms expanded.

Following the nationalization of the railways, in 1920 the two were sold to the Suttsu Railways, and re-numbered No. 1 and No. 2, serving Kutchan, Muroran, Asahikawa and Hakodate. Though they served their new purpose well, and were used extensively, one of the locomotives suffered an accidental collision on July 2, 1950, and was scrapped the following year.

Construction

The tender locomotives had their maker's standard 2-6-0 (1C) axle positions. Like the 7100 series, they bore a diamond-shaped chimney and cow catcher in the older American style, but had straight-top boilers instead of wagon-top ones, and a steam-dome in the second boiler compartment. The furnace was located between the second and third driving wheels, which were 1,372 mm (54.0 in) apart; the first and second driving wheels were 2,296 mm (90.4 in) apart. Of the tender's three axles, the second and third were bogies.

Main specifications

• Total length： 13,005 mm (42 ft 8.0 in)
• Total height：3,696 mm (12 ft 1.5 in)
• Axle positions： 2-6-0 (1C)
• Driving wheel diameter： 1,016 mm (40.0 in)
• Gauge: standard Stephenson gauge, American type
• Cylinders： 356 mm × 457 mm (14.0 in × 18.0 in)
• Boiler pressure： 7.71 kgf/cm² (756 kPa; 109.7 psi)
• Fire lattice area： 1.06 m² (11.4 sq ft)
• Total heat area： 69.8 m² (751 sq ft)
  • Steam： 55.7 m² (600 sq ft)
  • Furnace： 14.1 m² (152 sq ft)
• Boiler capacity： 2.3 m³ (81 cu ft)
• Smaller pipes： 454.5 mm × 2,489 mm (17.89 in × 97.99 in) (160 count)
• Locomotive operating weight： 24.33 t (23.95 long tons; 26.82 short tons)
• Locomotive weight empty： 22.05 t (21.70 long tons; 24.31 short tons)
• Driving wheel weight (running)： 20.12 t (19.80 long tons; 22.18 short tons)
• Driving wheel axle weight (largest)： 7.77 t (7.65 long tons; 8.56 short tons)
• Tender operating weight：15.44 t (15.20 long tons; 17.02 short tons)
• Tender weight empty： 8.43 t (8.30 long tons; 9.29 short tons)
• Water tank capacity： 4.22 m³ (149 cu ft)
• Fuel capacity： 1.88 t (1.85 long tons; 2.07 short tons)

See also

• Japan Railways locomotive numbering and classification

References

• The content represented here derives directly from the corresponding article on the Japanese Wikipedia.

Japanese Railway Locomotives Steam locomotives 150 160 860 2120 3380 3900 5100 5500 7010 7100 7170 8150 8620 9600 B20 C10 C11 C12 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 D50 D51 D52 D60 D61 D62 E10 Diesel locomotives DD11 DD13 DD14 DD15 DD16 DD17 DD18 DD19 DD20 DD50 DD51 DD53 DD54 DE10 DE11 DE15 DE50 DF50 DF200 HD300 Electric locomotives EB10 ED10 ED18 ED60 ED61 ED62 ED70 ED71 ED72 ED73 ED74 ED75 ED76 ED77 ED78 ED79 EF15 EF30 EF50 EF51 EF52 EF53 EF55 EF56 EF57 EF58 EF59 EF60 EF61 EF62 EF63 EF64 EF65 EF66 EF67 EF70 EF71 EF80 EF81 EH10 ED500 EF200 EF210 EF500 EF510 EH200 EH500 EH800 Chichibu DeKi 100 Chichibu DeKi 200 Chichibu DeKi 300 Chichibu DeKi 500 Meitetsu DeKi 300 Meitetsu DeKi 400 Meitetsu DeKi 600 Meitetsu Class EL120 Seibu E31 Seibu E851 Toei E5000