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SEK Class Θβ

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SEK class Θβ
Type and origin
Power typeSteam
BuilderHenschel & Sohn
Build date1912
Specifications
Configuration:
 • Whyte2-8-0
 • UIC1′D n4v
Gauge1,435 mm (4 ft 8+12 in)
Leading dia.850 mm (2 ft 9+12 in)
Driver dia.1,450 mm (4 ft 9+18 in)
Length17,905 mm (58 ft 9 in)
Height4,650 mm (15 ft 3+116 in)
Axle load14.15 tonnes (13.93 long tons; 15.60 short tons)
Adhesive weight56.60 tonnes (55.71 long tons; 62.39 short tons)
Loco weight69.97 tonnes (68.86 long tons; 77.13 short tons)
Total weight115.17 tonnes (113.35 long tons; 126.95 short tons)
Fuel typeCoal
Fuel capacity8 tonnes (7.9 long tons; 8.8 short tons)
Water cap.18,600 litres (4,100 imp gal; 4,900 US gal)
Firebox:
 • Grate area3.96 m2 (42.6 sq ft)
Boiler pressure15 kg/cm2 (1.47 MPa; 213 psi)
Heating surface:
 • Tubes213.0 m2 (2,293 sq ft)
 • Total surface226.7 m2 (2,440 sq ft)
CylindersFour, compound
High-pressure cylinder400 mm × 650 mm (15+34 in × 25+916 in)
Low-pressure cylinder640 mm × 650 mm (25+316 in × 25+916 in)
Performance figures
Maximum speed80 km/h (50 mph)
Career
OperatorsBDŽ → SEK → BŽD
NumbersBDŽ 806/811 → SEK 621/622 → SEK 521/522 → BŽD 17.72/17.73

SEK (Sidirodromoi Ellinikou Kratous, Hellenic State Railways) Class Θβ (or Class THb; Theta-beta) is a class of two 2-8-0 steam locomotives acquired after the First World War.[1]

Originally one of the Bulgarian State Railways' (BDŽ) 800 series four-cylinder compound locomotives that had been built by Henschel & Sohn in 1912 as BDŽ 806 and 811. They were given the class letters "Θβ" by the SEK and initially numbered 621 and 622 before being renumbered 521 and 522.

During World War II, they were reclaimed by the Bulgarians and renumbered BDŽ 17.72 and 17.73 at the end of the surviving 800s (which by then had become BDŽ class 17).

Notes

[edit]
  1. ^ Durrant 1972, p. 52.

References

[edit]
  • Durrant, A. E. (1972). The Steam Locomotives of Eastern Europe (2nd ed.). Newton Abbott: David & Charles. ISBN 0-7153-4077-8.