Tanganyika Railway MK class East African Railways 25 class
No. 2507 at Tabora depot, Tanzania, in 1968
Type and origin Power type Steam Builder Vulcan Foundry Serial number 3892–3896 (1925) 3942–3947 (1926) Build date 1925–1926 Total produced 11
Specifications Configuration: ​  • Whyte 2-8-2  • UIC 1′D1' h2 Gauge 1,000 mm (3 ft 3+3⁄8 in) Driver dia. 43 in (1,092 mm) Adhesive weight 40.1 long tons (40.7 t) Loco weight 57.7 long tons (58.6 t) Fuel type Oil Fuel capacity 1,300 imp gal (5,900 L; 1,600 US gal) Water cap. 3,500 imp gal (16,000 L; 4,200 US gal) Firebox: ​  • Grate area 27 sq ft (2.51 m2) Boiler pressure 160 psi (1.10 MPa) (165 psi (1.14 MPa)) Heating surface: ​  • Firebox 139 sq ft (12.9 m2)  • Tubes   1,306 sq ft (121.3 m2)  • Total surface 1,742 sq ft (161.8 m2) Superheater: ​  • Heating area 297 sq ft (27.6 m2) Cylinders 2 Cylinder size 18 in × 23 in (457 mm × 584 mm)
Performance figures Tractive effort 24,300 lbf (108.09 kN)
Career Operators Tanganyika Railway (TR) → East African Railways (EAR) Class TR: MK class EAR: 25 class Number in class 11 Numbers TR: 206–216/400–410 EAR: 2501–2511 Delivered 1925–1926
[1]

The TR MK class, later known as the EAR 25 class, was a class of 1,000 mm (3 ft 3+3⁄8 in) gauge 2-8-2 steam locomotives. The eleven members of the class were built by Vulcan Foundry, in Newton-le-Willows, Lancashire (now part of Merseyside), England, for the Tanganyika Railway (TR). They entered service on the TR in 1925–1926, and were later operated by the TR's successor, the East African Railways (EAR).^[2]

Class list

The builder's number, build year and fleet numbers of each member of the class were as follows:^[3]