Magyar Allamvasutak 4-8-0 Locomotives in Hungary
Class Details by Steve Llanso of Sweat House Media
Class 424/Nurmi (Locobase 1577)
Data from Skice Iglavni Podatci Lokomotiva diagram book (Zagreb, 1955), archived by Sre?ko Ignjatovi? at [
]. See also A[nthony] E[dward] Durrant, The steam locomotives of Eastern Europe (Abbot Newton: David & Charles, 1966),, pp. 39, 40; and []
Built between 1924 and 1958, with 365 going to the MAV and 149 to "foreign railways." Ziel and Eagleson (1973) identify the countries as Czechoslovakia, Yugoslavia, Hungary, and China.
http://origo ... notes that the class was modernized with "star blast pipe and double chimney" as well as smoke deflectors.
Ziel and Eagleson comment: "Perhaps the most beautiful example of this wheel arrangement ever built, the 424s were as mechanically perfect, powerful, and reliable as they were handsome." They were rated at 500 tons at 90 km/h (54 mph) for passenger service or 900 tons at 50 km/h (31 mph) in freight operations.
The Slovenian Railway Museum website -- [] -- notes that this class was nicknamed Nurmi (after the Finnish long-distance runner Paavo Nurmi) and Bivaly (Buffalo or Ox)
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 424/Nurmi |
| Locobase ID | 1577 |
| Railroad | Magyar Allamvasutak (MAV) |
| Country | Hungary |
| Whyte | 4-8-0 |
| Number in Class | 514 |
| Road Numbers | 424 001-424 365 |
| Gauge | Std |
| Number Built | 514 |
| Builder | MAVAG |
| Year | 1924 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 17.72 / 5.40 |
| Engine Wheelbase (ft / m) | 23.29 / 7.10 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.76 |
| Overall Wheelbase (engine & tender) (ft / m) | 56.45 / 17.21 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 32,518 / 14,750 |
| Weight on Drivers (lbs / kg) | 128,948 / 58,490 |
| Engine Weight (lbs / kg) | 187,613 / 85,100 |
| Tender Loaded Weight (lbs / kg) | 126,325 / 57,300 |
| Total Engine and Tender Weight (lbs / kg) | 313,938 / 142,400 |
| Tender Water Capacity (gals / ML) | 5549 / 21.02 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 9.90 / 9 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 54 / 27 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 63.20 / 1605 |
| Boiler Pressure (psi / kPa) | 203.10 / 1400 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 23.62" x 25.98" / 600x660 |
| Tractive Effort (lbs / kg) | 39,592 / 17958.65 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.26 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 148 - 2.047" / 52 |
| Flues (number - dia) (in / mm) | 33 - 5.236" / 133 |
| Flue/Tube length (ft / m) | 16.40 / 5 |
| Firebox Area (sq ft / m2) | 189.98 / 17.65 |
| Grate Area (sq ft / m2) | 48.01 / 4.46 |
| Evaporative Heating Surface (sq ft / m2) | 2119 / 196.90 |
| Superheating Surface (sq ft / m2) | 644 / 59.80 |
| Combined Heating Surface (sq ft / m2) | 2763 / 256.70 |
| Evaporative Heating Surface/Cylinder Volume | 160.83 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9751 |
| Same as above plus superheater percentage | 11,994 |
| Same as above but substitute firebox area for grate area | 47,459 |
| Power L1 | 14,394 |
| Power MT | 984.38 |