| Soviet locomotive class ИС | |
|---|---|
| Locomotive ИС20-317, circa 1935 | |
| Power type | Steam |
| Total produced | 649 |
| Configuration | 2-8-4 |
| Gauge | 1,524 mm (5 ft) |
| Leading wheel diameter |
1,050 mm (41.34 in) |
| Driver diameter | 1,850 mm (72.83 in) |
| Trailing wheel diameter |
1,050 mm (41.34 in) |
| Weight on drivers | 88 tonnes |
| Locomotive weight | 133 tonnes |
| Boiler pressure | 15 kgf/cm² (1.47 MPa; 213 psi) |
| Firegrate area | 7.04 m2 (75.8 sq ft) |
| Heating surface: Total |
295.2 m2 (3,178 sq ft) |
| Superheater area | 148.4 m2 (1,597 sq ft) |
| Cylinders | Two, outside |
| Cylinder size | 670 × 770 mm (26.38 × 30.31 in) |
| Top speed | 115 km/h (71 mph) |
| Tractive effort | 233.5 kN (52,490 lbf) |
The Soviet locomotive class IS (Russian: ИС) was a Soviet passenger steam locomotive type. The contract design was prepared in 1929 at the Kolomna factory. The ИС were manufactured between 1932 and 1942. They were named after Joseph Stalin (Russian: Иосиф Сталин).
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The steam locomotive was a 2-8-4. The locomotive used the same cylinders and boilers as the ФД (FD) series locomotives. However the ИС steam locomotive had a different wheel arrangement.
The first steam locomotive was released from the Kolomna factory on October 4, 1932. In April-December a steam locomotive was tested on the October-, Southern- and Ekaterinenskaya railways.
In 1936 production began at the Voroshilovograd factory. In total, 649 steam locomotives were constructed. Later it was renamed FDP (steam locomotive FD, passenger modification).
These locomotives were used until 1972.
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