The works diagram reproduced on a Czech-language website is Locobase's only source of information for this little tank.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | U 35.9 |
| Locobase ID | 5850 |
| Railroad | Czech State Rwy (CSD) |
| Country | Czechoslovakia |
| Whyte | 0-6-0T |
| Number in Class | |
| Road Numbers | |
| Gauge | 75 cm |
| Number Built | |
| Builder | CKD |
| Year | 1948 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.22 / 2.20 |
| Engine Wheelbase (ft / m) | 7.22 / 2.20 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 38,691 / 17,550 |
| Engine Weight (lbs / kg) | 38,691 / 17,550 |
| 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) | 21 / 10.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 27.60 / 700 |
| Boiler Pressure (psi / kPa) | 188.50 / 1300 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 10.83" x 14.17" / 275x360 |
| Tractive Effort (lbs / kg) | 9648 / 4376.26 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.01 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 82 - 1.85" / 47 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 7.22 / 2.20 |
| Firebox Area (sq ft / m2) | 43.69 / 4.06 |
| Grate Area (sq ft / m2) | 10.98 / 1.02 |
| Evaporative Heating Surface (sq ft / m2) | 315 / 29.28 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 315 / 29.28 |
| Evaporative Heating Surface/Cylinder Volume | 208.50 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2070 |
| Same as above plus superheater percentage | 2070 |
| Same as above but substitute firebox area for grate area | 8236 |
| Power L1 | 3062 |
| Power MT | 523.42 |