China State Railways / Chinese State Railways 2-8-2 Locomotives in China

Class Details by Steve Llanso of Sweat House Media

Class Jianshe (Construction) (Locobase 2160)

These post-Revolution SJ Mikados were the second most numerous standard locomotive class. Like the Qianjins, production of SJs ceased only in December 1988.


[] notes that one SJ was delivered new to the Boone & Scenic Valley Railroad in Iowa in 1989. Dr. Smith's data shows a relatively small boiler for the cylinders.

Class Jiefang / JF 6 / Mikaro (Locobase 6333)

According to Duncan Cotterill's Tractive Efforts website ( ...(visited 13 Oct 2004), JF 1 locomotives proved too heavy for many of the Manchurian lines. by Ejii Nozawa also notes that Sifang Railway Works in the PRC began producing this engine in July 1952 as the first domestically produced steam locomotive. 454 of this later class was delivered from 1952 to 1960.

Class SY (Aiming High) (Locobase 4221)

Data from for construction data. See also and railography's,

A design meant for light-duty operations and based on the JF-6 series of pre-war and wartime locomotives.

At least one has been exported to the United States and operates as New York, Susquehanna & Western #142 (20 June 2003)

"The New York, Susquehanna & Western Railroad's Chinese-built SY Class 2-8-2 is one of the newest steam locomotives in the world. Constructed in 1989 by the Tang Shun Locomotive and Rolling Stock Works not far from Beijing, China, 142 was originally constructed as no. 1647 for the Valley Railroad, a tourist line located in Essex, CT.

The Chinese SY Class engine is a redesigned manufacturing marvel based on the Pre-WWI American Locomotive Company's (Alco) original Mikados built for Japan. The design modifications migrated to Korea in the 1920s and eventually found their way to Manchuria where they became a standard Chinese engine class. These sleek and fuel efficient 90-ton locomotives share the same track gauge, air breaks, couplers and engineering details that are found on standard American built engines+making this stock Chinese steam locomotive adaptable to U.S. rails without modifications.

At the same time that the Valley Railroad's order was being manufactured at Tang Shun, a twin sister, engine no. 1651, was produced and shipped for the Knox & Kane Railroad in Marienville, PA."

Principal Dimensions by Steve Llanso of Sweat House Media
ClassJianshe (Construction)Jiefang / JF 6 / MikaroSY (Aiming High)
Locobase ID2160 6333 4221
RailroadChina State RailwaysChinese State RailwaysChina State Railways
Number in Class19164571988
Road Numbers
Number Built19164571988
Valve GearWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.50 / 4.4214.47 / 4.41
Engine Wheelbase (ft / m)33.43 / 10.1931.27 / 9.53
Ratio of driving wheelbase to overall engine wheebase 0.43 0.46
Overall Wheelbase (engine & tender) (ft / m)67.25 / 20.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)33,731 / 15,300
Weight on Drivers (lbs / kg)176,370 / 80,000147,000154,323 / 70,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)9250 / 35.046336 / 24
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)17.50 / 15.9010.60 / 9.60
Minimum weight of rail (calculated) (lb/yd / kg/m)73 / 36.5061 / 30.5064 / 32
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 137254 / 137053.90 / 1370
Boiler Pressure (psi / kPa)219 / 15.10198.70 / 13.70198.70 / 13.70
High Pressure Cylinders (dia x stroke) (in / mm)22.8" x 28" / 579x71120.87" x 27.95" / 530x71020.87" x 27.95" / 530x710
Tractive Effort (lbs / kg)50,176 / 22759.4838,076 / 17271.0038,147 / 17303.21
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.52 3.86 4.05
Heating Ability
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)55 / 5.1149.17 / 4.5748.42 / 4.50
Evaporative Heating Surface (sq ft / m2)1944 / 180.671851 / 1721851 / 172
Superheating Surface (sq ft / m2)959 / 89.13522 / 48.50461 / 42.80
Combined Heating Surface (sq ft / m2)2903 / 269.802373 / 220.502312 / 214.80
Evaporative Heating Surface/Cylinder Volume146.92167.26167.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12,04597709621
Same as above plus superheater percentage16,02011,91911,545
Same as above but substitute firebox area for grate area
Power L1
Power MT

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