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SEK class Μα
SEK class Μα steam locomotive Μα-1002 on display at Rouf Station.
Type and origin Power type Steam Designer Breda Builder Breda (10), Ansaldo Build date 1953–1954 Total produced 20 Rebuilder Henschel & Son Rebuild date 1957–1958 Number rebuilt 20
Specifications Configuration: ​  •  Whyte 2-10-2  •  UIC 1′E1′ h2 Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 850 mm (33.5 in) Driver dia. 1,600 mm (63.0 in) Trailing dia. 1,050 mm (41.3 in) Length 24.93 m (81 ft 9 in) Height 4.51 m (14 ft 10 in) Axle load 20 tons Adhesive weight 100 tons Loco weight 136 tons Tender weight 66 tons Tender type 2′2′ Fuel type Originally: coal, later: fuel oil Fuel capacity 12 tons Water cap. 25,000 L (5,500 imp gal; 6,600 US gal) Firebox: ​  • Grate area 5.60 m2 (60.3 sq ft) Boiler pressure 18 bar (1.8 MPa; 260 psi) Heating surface: ​  • Tubes and flues 316 m2 (3,400 sq ft) Superheater: ​  • Heating area 125 m2 (1,350 sq ft) Cylinders Two Cylinder size 660 mm × 750 mm (26.0 in × 29.5 in) Valve gear Heusinger Valve type Piston valves
Performance figures Maximum speed 110 km/h (68 mph) Power output 2,950 hp (2,200 kW) Tractive effort 312.33 kN (70,215 lbf)
Career Operators Hellenic State Railways Number in class 20 Numbers 1001–1020 Delivered 1954 Retired early 1970s Preserved 2

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.

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passenger trains on Piraeus–Thessaloniki and Thessaloniki–Idomeni mainlines until the early 1970s, when they were withdrawn by the Hellenic Railways Organisation (successor of SEK) due to complete conversion to diesel traction.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 locomotive 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

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