SEK class Μα

SEK (Sidirodromoi Ellinikou Kratous, Hellenic State Railways) class Μα (or class Ma; Mu-alpha) was a class of 2-10-2 steam locomotives built by Ansaldo and Breda in 1953. They were numbered Μα 1001-1020.

SEK class Μα
SEK class Μα steam locomotive Μα-1002 on display at Rouf Station.
Type and origin
Power typeSteam
DesignerBreda
BuilderBreda (10),
Ansaldo
Build date1953–1954
Total produced20
RebuilderHenschel & Son
Rebuild date1957–1958
Number rebuilt20
Specifications
Configuration:
  Whyte2-10-2
  UIC1′E1′ h2
Gauge1,435 mm (4 ft 8 12 in)
Leading dia.850 mm (33.5 in)
Driver dia.1,600 mm (63.0 in)
Trailing dia.1,050 mm (41.3 in)
Length24.93 m (81 ft 9 in)
Height4.51 m (14 ft 10 in)
Axle load20 tons
Adhesive weight100 tons
Loco weight136 tons
Tender weight66 tons
Tender type2′2′
Fuel typeOriginally: coal,
later: fuel oil
Fuel capacity12 tons
Water cap25,000 l (5,500 imp gal; 6,600 US gal)
Firebox:
  Firegrate area
5.60 m2 (60.3 sq ft)
Boiler pressure18 bar (1.8 MPa; 260 psi)
Heating surface:
  Tubes and flues
316 m2 (3,400 sq ft)
Superheater:
  Heating area125 m2 (1,350 sq ft)
CylindersTwo
Cylinder size660 mm × 750 mm (26.0 in × 29.5 in)
Performance figures
Maximum speed90 km/h (56 mph)
Power output2,950 hp (2,200 kW)
Tractive effort312.4 kN (70,230 lbf)
Career
OperatorsHellenic State Railways
Number in class20
Numbers1001–1020
Delivered1954
Retiredearly 1970s
Preserved1

The Μα locomotives were the last steam locomotives acquired by SEK before conversion to diesel traction. They were designed and built in Italy by Breda (10 units) and Ansaldo (10 units) in 1953–1954, while some parts (including whole tender underframes) were made by Nuove Reggiane. The length of the locomotive with the tender was 24.93 m, the maximum height 4.51 m and service weight 136 tn. The boiler operated at 18 bar and their rated power was 2950 hp. Maximum speed was 90 km/h.

Due to various technical problems, only two years after introduction they were modified by Henschel (1957–1958). The boilers were converted to burn heavy fuel oil.

These locomotives were based at Aghios Ioannis Rentis and Thessaloniki depots and were used mainly for freight trains and for some express passenger trains on Piraeus–Thessaloniki and Thessaloniki–Idomeni mainlines until the early 1970s, when they were withdrawn by the Hellenic Railways Organisation (successor of SEK) due to complete conversion to diesel traction.

Only two examples survived the 1984-1985 steam locomotives scrappings. One of them, 1002 was set on display as part of the theatre "Το Τρένο στο Ρουφ" (="The Train at Rouf"), at Rouf station in Athens.

References

  • G Handrinos & Tim Hills: "Αφιέρωμα Breda: Σειρά Μα 1001-1020", Σιδηροτροχιά, issue 35, pp. 29–43, June 2009


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