Czech State Rwy 2-4-2 Locomotives in Czechoslovakia

Class Details by Steve Llanso of Sweat House Media

Class M 273.1 (Locobase 1640)

Data from [], last accessed 24 December 2012, supplemented by [] . Locobase 14767 describes the twenty DT 1 bi-directional locomotives delivered to the BBOe in 1935-1938. The M 273s were a slightly revised design with a larger grate that was adopted as a response to shortages in oil fuel that affected motor bus traffic.

Unlike those engines, which quickly went into branch-line service, these began by pulling trains over the 450 km (279 miles) between Slovakia's capital Bratislava and Presov. They were rated at 100 kmh (62 mph) pulling 109 tons on the level and 55-60 kmh (34-37 mph) up a 1 1/2% grade.

Cylinders were supplied through Lentz poppet valves. Like the DT 1s, their profile resembled a bi-directional diesel switcher, the typical cylindrical boiler hidden by deep water tanks and a tall, narrow skyline casing. Behind the cab was a high structure housing the coal bunker and baggage section. Both auxiliary trucks used Adams bogies.

After World War Two, all six were taken into the postwar CSD, which retired them in 1953-1954.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassM 273.1
Locobase ID1640
RailroadCzech State Rwy (CSD)
Number in Class6
Road NumbersM 273 101-M 273 106
Number Built6
Valve GearHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.50 / 3.20
Engine Wheelbase (ft / m)25.13 / 7.66
Ratio of driving wheelbase to overall engine wheelbase 0.42
Overall Wheelbase (engine & tender) (ft / m)25.13 / 7.66
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)58,239 / 26,417
Engine Weight (lbs / kg)105,279 / 47,754
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)105,279 / 47,754
Tender Water Capacity (gals / ML)1584 / 6
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57.10 / 1450
Boiler Pressure (psi / kPa)261.10 / 18
High Pressure Cylinders (dia x stroke) (in / mm)11.42" x 22.44" / 290x570
Tractive Effort (lbs / kg)11,375 / 5159.62
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.12
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)55.97 / 5.20
Grate Area (sq ft / m2)13.46 / 1.25
Evaporative Heating Surface (sq ft / m2)539 / 50.10
Superheating Surface (sq ft / m2)222 / 20.63
Combined Heating Surface (sq ft / m2)761 / 70.73
Evaporative Heating Surface/Cylinder Volume202.61
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3514
Same as above plus superheater percentage4534
Same as above but substitute firebox area for grate area18,852
Power L126,310
Power MT1991.91

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