The Barui class (バルイ) was a class of steam tank locomotives of the Chosen Government Railway (Sentetsu) with 4-6-4 wheel arrangement. The "Baru" name came from the American naming system for steam locomotives, under which locomotives with 4-6-4 wheel arrangement were called "Baltic".

Chosen Government Railway Barui class (バルイ) Korean National RR Baru1 class (바루1) Korean State Railway Baruha class (바루하)
Sentetsu steam locomotive バルイ503
Type and origin Power type Steam Builder Baldwin Build date 1913−1914 Total produced 12
Specifications Configuration: ​  • Whyte 4-6-4T Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 1,520 mm (60 in) Length 13,552 mm (533.5 in) Width 3,048 mm (120.0 in) Height 4,456 mm (175.4 in) Adhesive weight 52.42 t (51.59 long tons) Loco weight 150.0 t (147.6 long tons) Fuel capacity 1.0 t (0.98 long tons; 1.1 short tons) Water cap. 11.3 m3 (3,000 US gal) Firebox:  • Firegrate area 2.78 m2 (29.9 sq ft) Boiler: ​  • Small tubes 196 x 51 mm (2.0 in) Boiler pressure 12.0 kgf/cm2 (171 psi) Heating surface 130.8 m2 (1,408 sq ft)  • Tubes 116.1 m2 (1,250 sq ft)  • Firebox 14.7 m2 (158 sq ft) Cylinder size 450 mm × 660 mm (18 in × 26 in) Valve gear Walschaerts
Performance figures Maximum speed 75 km/h (47 mph) Tractive effort 95.0 kN (21,400 lbf)
Career Operators Chosen Government Railway Korean National Railroad Korean State Railway Class Sentetsu: バルイ KNR: 바루1 KSR: 바루하 Number in class Sentetsu: 12 KNR: 3 KSR: 9 Numbers バルイ1–バルイ12 Delivered 1913−1914

To meet the needs of ever-increasing freight traffic, four were built by the Baldwin Locomotive Works of the United States for Sentetsu in 1913,[1] who used them primarily on the Gyeongwon Line.[2] Another two were built in 1914, and subsequently a further six were added, and a total of twelve were in service at the time of Japan's defeat in the Pacific War in 1945.[1]

Initially numbered バルイ501 through バルイ512, they received the バルイ1 through バルイ12 numbers in Sentetsu's general renumbering of 1938.

After the partition of Korea, three went to the Korean National Railroad in South Korea, where they were called 발틱1 (or 발틱) class (Baltik), and nine to the Korean State Railway in North Korea, where they were designated 바루하 class (Paruha).[3]

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