Russian locomotive class Ye

Russian class Е [Ye]
Еа-629 (Ел-629) as a monument in Ussuriysk (Primorsky Krai)
Type and origin Power type Steam Builder Baldwin Locomotive Works American Locomotive Company Canadian Locomotive Company Model 12-44 F Build date 1915–1918; 1943–1947 Total produced 3,193+
Specifications Configuration: ​  • Whyte 2-10-0  • UIC 1′E h2 Gauge 5 ft (1,524 mm) Those remaining in US or going to China Railway, converted to 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 52 in (1,321 mm) Length 72 ft 9 in (22.17 m) Adhesive weight 180,200 lb (81,700 kg) Loco weight 207,700 lb (94,200 kg) Total weight 342,500 lb (155,400 kg) Fuel type Coal Fuel capacity 40,000 lb (18,100 kg) Water cap. 7,000 US gal (26,000 L; 5,800 imp gal) Firebox: ​  • Grate area 64.7 sq ft (6.01 m2) Boiler pressure 180 psi (1.24 MPa) Heating surface 2,594 sq ft (241.0 m2) Superheater: ​  • Heating area 569 sq ft (52.9 m2) Cylinders Two Cylinder size 25 in × 28 in (635 mm × 711 mm) Valve gear Walschaerts
Performance figures Maximum speed 55 mph (89 km/h) Tractive effort 51,500 lbf (229.08 kN)
Career Operators Imperial Russian Government; Finnish State Railways; Various American railways.

The Russian locomotive class Ye, and subclasses Ye^a, Ye^k, Ye^l, Ye^f, Ye^m, Ye^mv and Ye^s (Russian: Паровоз Е; Е^а, Е^к, Е^л, Е^ф, Е^м, Е^мв and Е^с) were a series of 2-10-0 locomotives built by American builders for the Russian railways in World War I and again in World War II. They were lightweight engines with relatively low axle loadings.

Due to the Bolshevik revolution in 1917, 200 locomotives were stranded in the United States so these were fitted with wider tires: locomotive driving wheels had steel tires which were heated to expand them, then driven over the wheels so that they shrank into place. By fitting wider tires with a deeper tread width, the effective wheel gauge could be decreased from the Russian standard of 5 ft (1,524 mm) to 4 ft 8+1⁄2 in (1,435 mm) (the US standard) to fit the American gauge, and could then be sent to various railroads. The locomotives were nicknamed "Russian Decapods."

A number of locomotives were acquired by the Finnish railways (class Tr2)^[1] and by the China Railway (class DK2)