China Railway class QJ
Between 1956 and 1960, various factories in China manufactured a total of 42 prototypes of a new 2-10-2 freight locomotive, which was based on the Soviet ОР21. From 1964 onwards, series production of a total of 4,675 additional machines, which were soon referred to as QJ, began in Datong. The abbreviation here stood for “Qianjin”, which means “progress”.
They replaced the JF and FD in heavy freight service and also pulled heavy passenger trains. In addition to the stoker and mostly smoke deflectors, their features also included the distinctive air horn. Some QJs were also built in Soviet broad gauge. A chimney similar to the Giesl ejector was tested on other machines.
Although production continued until 1988, replacement with diesel locomotives began in the eighties. After steam operations on the Chinese State Railways officially ended in 2002, the last of them disappeared from the main lines in 2003. However, the private JiTong Railway used the QJ to transport coal on its 945 km long line in Inner Mongolia until 2005 and it was also used by industrial companies until around 2010. Three QJs later found their way to the USA.
Technical data
General
| Property | four-axle tender | six-axle tender |
|---|---|---|
| Built | 1956-1988 | |
| Manufacturers | Datong | |
| Wheel arrangement | 2-10-2 (Santa Fé) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | four-axle tender | six-axle tender |
|---|---|---|
| Length | 26.01 m | 29.21 m |
| Length loco | 16.14 m | |
| Wheelbase | 15.37 m | |
| Total wheelbase | 26.26 m | |
| Service mass | 133.3 t | |
| Adhesion mass | 106 t | |
| Total mass | 220 t | 253 t |
| Rigid wheelbase | 6.40 m | |
| Axle load | 21.2 t | |
| Water capacity | 39,500 l | 50,000 l |
Boiler
| Property | four-axle tender | six-axle tender |
|---|---|---|
| Grate area | 6.8 m² | |
| Firebox surface | 32.5 m² | |
| Tube heating surface | 222.8 m² | |
| Evaporative heating surface | 255.3 m² | |
| Superheater surface | 144.1 m² | |
| Total heating surface | 399.4 m² | |
Power plant
| Property | four-axle tender | six-axle tender |
|---|---|---|
| Driver diameter | 1,500 mm | |
| Boiler pressure | 14.7 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 650 x 800 mm | |
Power
| Property | four-axle tender | six-axle tender |
|---|---|---|
| Power source | steam | |
| Indicated power | 2,192 kW (2,980 PS) | |
| Top speed | 80 km/h | |
| Starting effort | 281.6 kN | |
Calculated values
| Property | four-axle tender | six-axle tender |
|---|---|---|
| Factor of adhesion | 1 : 3.69 | |
| Optimal speed | 48 km/h | |
| Power-to-weight ratio | 16.4 kW/t | |
| Heating Surface Equivalent | 706.0 m² | |
| Cylinder volume/HSE | 1 : 752.02 | |
| Adhesive weight/Total | 1 : 1.26 | |
| Tractive force/Heating surface | 1 : 14.72 | |
| Grate area/Heating surface | 1 : 58.74 | |
| Firebox/Tube surface | 1 : 6.86 | |
| Total/Superheater | 1 : 1.77 | |