China Railways MT1 Mantetsu Matei class (マテイ)
Builder's photo of マテイ1800.
Type and origin Power type Steam Builder Kawasaki; Hitachi Build date 1936 Total produced 7
Specifications Configuration: ​  • Whyte 4-8-2 Gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge Driver dia. 1,750 mm (68.9 in) Length 25,981 mm (85 ft 2+7⁄8 in) Width 3,123 mm (10 ft 3 in) Height 4,740 mm (15 ft 6+5⁄8 in) Adhesive weight 83.39 t (82.07 long tons; 91.92 short tons) Loco weight 126.28 t (124.29 long tons; 139.20 short tons) Tender weight 85.00 t (83.66 long tons; 93.70 short tons) Total weight 211.28 t (207.94 long tons; 232.90 short tons) Fuel type Coal Fuel capacity 15.00 t (14.76 long tons; 16.53 short tons) Water cap. 35.00 m3 (1,236 cu ft) Firebox: ​  • Grate area 5.36 m2 (57.7 sq ft) Boiler: ​  • Small tubes 93 x 51 mm (2.0 in)  • Large tubes 108 x 90 mm (3.5 in) Boiler pressure 14.5 kgf/cm2 (206 psi) Heating surface: ​  • Firebox 28.71 m2 (309.0 sq ft)  • Tubes 266.77 m2 (2,871.5 sq ft)  • Total surface 395.66 m2 (4,258.8 sq ft) Superheater: ​  • Type Schmidt type E  • Heating area 100.18 m2 (1,078.3 sq ft) Cylinder size 630 mm × 760 mm (24.80 in × 29.92 in)
Performance figures Maximum speed 90 km/h (56 mph) Tractive effort 208.37 kN (46,840 lbf)
Career Operators South Manchuria Railway China Railway Class SMR: マテイ CR: ㄇㄎ一 (1951–1959) CR: MT1 (1959–end) Number in class 17 Numbers SMR: 1800–1806 (1936–1938) SMR: マテイ1–7 (1938–1945) CR: 1–7

The China Railways MT1 class steam locomotive was a class of 4-8-2 steam locomotives for goods trains operated by the China Railway. They were originally built in Japan for the South Manchuria Railway (Mantetsu) in 1936.^[1] The "Mate" name came from the American naming system for steam locomotives, under which locomotives with 4-8-2 wheel arrangement were called "Mountain".

As the development of Manchukuo continued and the population of cities like Xinjing and Harbin grew, it became necessary to transport increasing quantities of fresh foods to the north. To fill this need, express fish trains were planned, for which a goods locomotive capable of high speed operation was required. The result of this requirement was the Matei class superheated tender locomotive built in 1936. They were the largest Mantetsu locomotives in terms of length and weight, and were equipped with a Schmidt type E superheater, a feedwater heater, and an automatic stoker. Originally planned with a 4-6-2 wheel arrangement and intended for high-speed transport of perishable foods to the north, but the need to pull regular goods trains southbound led to the use of a 4-8-2 arrangement for traction and larger wheel diameter for increased speed.^[1] A total of seven were built by Kawasaki and Hitachi in 1936. They were used mainly on express goods trains between Dalian and Xinjing, and could pull 1,700 t (1,700 long tons; 1,900 short tons) of freight at 90 km/h (56 mph), and they were also occasionally used on southbound passenger trains.^[1]

At the end of the Pacific War, all seven were assigned to the Sujiatun locomotive depot of the Fengtian Railway Bureau, and all were taken over by the Republic of China Railway. Following the establishment of the People's Republic and the subsequent creation of the current China Railway, they became class ㄇㄉ一 (MT1) in 1951, becoming class MT1 (written in Pinyin instead of Zhuyin) in 1959, and numbered 1–7. Numbers 5 and 6 were in service at the Hegang mine in 1985.^[2]