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Su 2-6-2
# 252-21 Depot Khristinovka
# 251-86 Depot Chernovtsy
Built: Kolomna - 1925-29 (type 1), 1932-35 (type 2), 1935-39 (type 3), 1940-41 (Sum); Lugansk, Bryansk, Khar'kov- 1925-26 (type 1); Sormovo - 1925-29 (type 1), 1932-36 (type 2), 1947-51 (type 4)
Quantity built: 2682+
Number series: type 1 - series 96-101; type 2 - 200-209; type 3 - 210-215; Sum - 216-218; type 4 - 250-254 (up to 254-11) (01-99 in most series)
Purpose: Passenger
Power: 1177 kWH (60 km/h; 0-6)
Tractive effort: 118 kN (24 km/h; 0-7)
Maximum speed: 115 km/h
Grate area: 4-67 m2
Heating surface: 187-76 m2
Superheater surface: 89-35 m2
Boiler pressure: 13, later 14 kg.f./cm2
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Cylinders: 575 x 700 mm
Driving wheels: 1850 mm
Length: 13,423 + 9943 mm
Weight (locomotive): 86-66 t.
Adhesive weight: 54-55 t.
Empty weight (locomotive): 77-8 t.
Empty weight (tender): 35 t. (type P27)
Fuel capacity: 20 t. coal
Water capacity: 27 m2
Maximum axle weight: 18-22 t.
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Notes: The Su (usilennyi - strengthened) was a mid-1920's redesign of Kolomna's class Sv 2-6-2, introduced in 1915 for the Warsaw-Vienna Railway. The latter arguably represented the culmination of pre-revolutionary passenger design and was in turn descended from Sormovo's S class of 1910. The Su was built in four basic types and a modernised version (Sum), which was fitted with smokebox fan (subsequently removed) and smoke deflectors. As the standard Soviet passenger type, the Su was found throughout the system, employed on suburban as well as long-distance services. Nearly 2000 remained in stock in 1967 (886 active), but there were only 267 (43 active) a decade later and 57 in stock by 1984; their final passenger duties were in 1979 in the Novgorod area. The last two survivors - Su 252-94 and -95 - were used as stationary boilers alongside Tallinn station for many years until the early 1990's. (Technical data given above is for type 4).
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