South Manchurian Railway Pashiro class
China Railway SL6
Some similar types of Pacific locomotives were combined in the Pashiro class, which were built from 1933 by various manufacturers for several railway companies with a focus on Manchuria. The vast majority were of a type built by Kawasaki, Nippon Sharyo and Hitachi for the Manchukuo State Railways. They were called “New National Great Pashi” to distinguish them from the Pashisa class. Mantetsu procured 45 examples, some of which were built in Dalian. Eight went to the Central China Railway, which used them under the designation KC100.
Compared to the Pacifics previously used in Manchuria, the major innovations consisted of a boiler with a combustion chamber and a feedwater heater. With a locomotive service weight of just over 100 tonnes, they were also heavier and at the same time they had a larger tender. The engines of Mantetsu received the largest tender with an operating weight of more than 83 tonnes, the tenders of the other operators weighed between 71 and 73 tonnes when loaded. With the 57 examples built directly for the North China Railway during the war, there were a total of 254 by 1944.
After World War II, there were a few locomotives in Korea that were among the 25 originally loaned by the Manchukuo State Railways to what was then Chosen. The Chinese State Railways took over well over 200 examples and classified them as SL6. Due to the lack of more modern locomotive types, another 151 were built between 1956 and 1958. The locomotives were eventually used throughout China and were essential for passenger service. The last ones were even used until 1991.
Technical data
General
| Property | Pashiro | Large Pashi | New Large Pashi | SL6 |
|---|---|---|---|---|
| Built | 1934-1943 | 1933 | 1936-1940 | 1956-1958 |
| Manufacturers | Hitachi, Kawasaki, Shahekou | Kawasaki, Hitachi, Nippon Sharyō, Kisha Seizō | Kawasaki, Hitachi, Nippon Sharyō | Sifang |
| Wheel arrangement | 4-6-2 (Pacific) | |||
| Gauge | 1,435 mm (Standard gauge) | |||
Dimensions and weights
| Property | Pashiro | Large Pashi | New Large Pashi | SL6 |
|---|---|---|---|---|
| Length | 23.77 m | 22.39 m | 22.42 m | 22.62 m |
| Service mass | 102 t | 100.7 t | 100.2 t | |
| Adhesion mass | 61.8 t | 62.2 t | ||
| Total mass | 185.3 t | 171.7 t | 173.7 t | 172.6 t |
| Water capacity | 35,000 l | 25,000 l | 30,000 l | |
| Fuel capacity | 15 t (coal) | 17 t (coal) | 14 t (coal) | |
Boiler
| Property | Pashiro | Large Pashi | New Large Pashi | SL6 |
|---|---|---|---|---|
| Grate area | 4.82 m² | 4.84 m² | ||
| Firebox surface | 22.6 m² | |||
| Tube heating surface | 177 m² | |||
| Evaporative heating surface | 199.6 m² | 193.03 m² | ||
| Superheater surface | 67.2 m² | 97.03 m² | ||
| Total heating surface | 266.8 m² | 290.1 m² | ||
Power plant
| Property | Pashiro | Large Pashi | New Large Pashi | SL6 |
|---|---|---|---|---|
| Driver diameter | 1,750 mm | |||
| Boiler pressure | 14 bar | |||
| Expansion type | simple expansion | |||
| Cylinders | two, 570 x 660 mm | |||
Power
| Property | Pashiro | Large Pashi | New Large Pashi | SL6 |
|---|---|---|---|---|
| Power source | steam | |||
| Estimated power | 1,600 kW (2,175 PS) | 1,800 kW (2,447 PS) | ||
| Starting effort | 145.8 kN | |||
Calculated values
| Property | Pashiro | Large Pashi | New Large Pashi | SL6 |
|---|---|---|---|---|
| Factor of adhesion | 1 : 4.15 | 1 : 4.19 | ||
| Optimal speed | 68 km/h | 76 km/h | ||
| Power-to-weight ratio | 15.7 kW/t | 15.9 kW/t | 18.0 kW/t | |
| Heating Surface Equivalent | 447.0 m² | |||
| Cylinder volume/HSE | 1 : 753.54 | |||
| Adhesive weight/Total | 1 : 1.65 | 1 : 1.62 | 1 : 1.61 | |
| Tractive force/Heating surface | 1 : 11.41 | 1 : 10.50 | ||
| Grate area/Heating surface | 1 : 55.35 | 1 : 59.93 | ||
| Firebox/Tube surface | 1 : 7.83 | |||
| Total/Superheater | 1 : 2.97 | 1 : 1.99 | ||