Czech State Rwy Articulated Locomotives in Czechoslovakia


Class Details by Steve Llanso of Sweat House Media

Class 623.0 (Locobase 7993)

Data from [], last accessed 11 October 2013.

After the Czech Republic was founded in 1918, the railway decided to adopt the Hungarian Class VIm Mallet articulated. The design seems to have remained essentially the same, although all of the boiler and firebox dimensions were tweaked.

Some were later superheated; see Locobase 7994.


Class 623.003 - superheated (Locobase 7994)

Data from [], last accessed 11 October 2013.

Although these engines were originally delivered as saturated engines similar to an earlier Hungarian design (Locobase 7993), the CSD soon superheated the batch. Seven--001, 005, 006, 011, 012, 014 and 016--received the Metcalfe exhaust steam injector, which was credited with a savings of 10-12% in fuel consumption.

Principal Dimensions by Steve Llanso of Sweat House Media

Class623.0623.003 - superheated
Locobase ID7993 7994
RailroadCzech State Rwy (CSD)Czech State Rwy (CSD)
CountryCzechoslovakiaCzechoslovakia
Whyte0-6-6-00-6-6-0
Number in Class1616
Road Numbers623.001-623.016
GaugeStdStd
Number Built16
Builder
Year19221922
Valve GearHeusingerHeusinger
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)171,960 / 78,000171,850 / 77,950
Engine Weight (lbs / kg)171,960 / 78,000171,850 / 77,950
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)171,960 / 78,000171,850 / 77,950
Tender Water Capacity (gals / ML) / 205280 / 20
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) / 1213.20 / 12
Minimum weight of rail (calculated) (lb/yd / kg/m)48 / 2448 / 24
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46.30 / 117548 / 1220
Boiler Pressure (psi / kPa)232.10 / 16232.10 / 16
High Pressure Cylinders (dia x stroke) (in / mm)15.75" x 24.02" / 400x61015.75" x 24.02" / 400x610
Low Pressure Cylinders (dia x stroke) (in / mm)23.62" x 24.02" / 600x61023.62" x 24.02" / 600x610
Tractive Effort (lbs / kg)35,150 / 15943.7933,905 / 15379.07
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.89 5.07
Heating Ability
Tubes (number - dia) (in / mm)261 - 2.047" / 52110 - 2.047" / 52
Flues (number - dia) (in / mm) / 135
Flue/Tube length (ft / m)16.40 / 516.40 / 5
Firebox Area (sq ft / m2)162.05 / 15.06154.19 / 14.33
Grate Area (sq ft / m2)36.80 / 3.4239.17 / 3.64
Evaporative Heating Surface (sq ft / m2)2525 / 234.621845 / 171.46
Superheating Surface (sq ft / m2)824 / 76.60
Combined Heating Surface (sq ft / m2)2525 / 234.622669 / 248.06
Evaporative Heating Surface/Cylinder Volume466.18340.63
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation85419091
Same as above plus superheater percentage854111,910
Same as above but substitute firebox area for grate area37,61246,882
Power L1490415,291
Power MT377.231176.99

All material Copyright © SteamLocomotive.com
Wes Barris