Czech State Rwy 2-8-4 Locomotives in Czechoslovakia

Class Details by Steve Llanso of Sweat House Media

Class 486.1 (Locobase 1668)

According to Hans Schaefer, [] (15 Sept 2003)), this 2-8-4 from CKD competed against Skoda's 4-8-2 486.0 class (Locobase 1667) as a 4-axle replacement for the Class 387 and 399 Pacifics. The 486.0 was chosen and these three were the only ones of this arrangement to be built by the Czech Railway to this design.

See the museum website [][] for a history of the CKD firm.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID1668
RailroadCzech State Rwy (CSD)
Number in Class3
Road Numbers
Number Built3
Valve GearHeusinger
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)143,136 / 64,925
Engine Weight (lbs / kg)241,024 / 109,327
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)60 / 30
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)72.10 / 1831
Boiler Pressure (psi / kPa)232.10 / 16
High Pressure Cylinders (dia x stroke) (in / mm)21.7" x 26.8" / 551x681 (3)
Tractive Effort (lbs / kg)51,797 / 23494.75
Factor of Adhesion (Weight on Drivers/Tractive Effort) 2.76
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)53.80 / 5
Evaporative Heating Surface (sq ft / m2)2908 / 270.26
Superheating Surface (sq ft / m2)1136 / 105.58
Combined Heating Surface (sq ft / m2)4044 / 375.84
Evaporative Heating Surface/Cylinder Volume168.99
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12,487
Same as above plus superheater percentage15,983
Same as above but substitute firebox area for grate area
Power L1
Power MT

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