Korean Government Railways 2-8-2 Locomotives in Korea


Class Details by Steve Llanso of Sweat House Media

Class Mika-1 (SMR) (Locobase 3083)

Drawn from the North & South Korean Locomotives Website -- [] . Data from table supplied to the site by Yuuji Oikawa (link later died). See also in Wikipedia at [], last accessed 5 July 2019.

The class leaders were built by Alco in 1918 with additional engines supplied by Shakakou, Kisha, and Kawasaki.

NB: Firebox heating surface area is calculated from the stated evaporative heating surface area minus the area derived from tube and flue counts, lengths and diameters


Class Mika-2/-3/-4 (Locobase 3082)

Drawn from the North & South Korean Locomotives Website -- [] . Data from table supplied to the site by Yuuji Oikawa.

This is a pretty small Mikado, but obviously suited for the job as it was built in relatively large numbers. Suppliers ranged from Alco to Kawasaki to Seoul to Kisha, the last two Korean builders. At the 1947 partition, South Korea kept 131 and North Korea took the lion's share of 292.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassMika-1 (SMR)Mika-2/-3/-4
Locobase ID3083 3082
RailroadKorean Government RailwaysKorean Government Railways
CountryKoreaKorea
Whyte2-8-22-8-2
Number in Class420
Road Numbers1500-1570
GaugeStdStd
Number Built420
Builderseveralseveral
Year19181927
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)167,926 / 76,170153,111 / 69,450
Engine Weight (lbs / kg)217,640 / 98,720199,850 / 90,651
Tender Loaded Weight (lbs / kg)145,064 / 65,800145,064 / 65,800
Total Engine and Tender Weight (lbs / kg)362,704 / 164,520344,914 / 156,451
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)70 / 3564 / 32
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 137257.10 / 1450
Boiler Pressure (psi / kPa)205 / 14.10201.40 / 13.90
High Pressure Cylinders (dia x stroke) (in / mm)23" x 28" / 584x71122.83" x 27.95" / 580x710
Tractive Effort (lbs / kg)47,796 / 21679.9343,675 / 19810.67
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.51 3.51
Heating Ability
Tubes (number - dia) (in / mm)195 - 2" / 51118 - 2" / 51
Flues (number - dia) (in / mm)32 - 5.5" / 14028 - 5.5" / 140
Flue/Tube length (ft / m)18.42 / 5.6116.31 / 4.97
Firebox Area (sq ft / m2)195
Grate Area (sq ft / m2)54.45 / 5.0651.11 / 4.75
Evaporative Heating Surface (sq ft / m2)2924 / 271.752546 / 236.62
Superheating Surface (sq ft / m2)711 / 66.08662 / 61.52
Combined Heating Surface (sq ft / m2)3635 / 337.833208 / 298.14
Evaporative Heating Surface/Cylinder Volume217.16192.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,16210,294
Same as above plus superheater percentage13,39512,455
Same as above but substitute firebox area for grate area47,970
Power L114,111
Power MT741.03

All material Copyright © SteamLocomotive.com
Wes Barris