New Zealand Government Railways 0-6-4 Locomotives in New_Zealand
Class Details by Steve Llanso of Sweat House Media
Class R Single Fairlie (Locobase 5182)
Data from John Garner's comprehensive site at [
] ... (October 2002)
A Single Fairlie with the trailing bogie given lateral (the axles moving side to side), radial (the bogie swinging side to side around a pivot), and rolling motion freedom. As Garner points out, this made these engines rather unsteady at speed. He notes, however, that one of the class reached 53 mph, which must have been at least scary. This class was followed by the longer S class.
Class S Single Fairlie (Locobase 5183)
Data from John Garner's comprehensive site at [] ... (October 2002)
These were larger, longer Single Fairlies than the earlier Rs, with all the length added between the drivers and the trailing bogie. One supposes that their reputation for good riding came from the damping effect of this extra length. In any event, that quality and a roomy cab (evident in photographs) made them popular with their crews, says Garner.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | R Single Fairlie | S Single Fairlie |
| Locobase ID | 5182 | 5183 |
| Railroad | New Zealand Government Railways | New Zealand Government Railways |
| Country | New Zealand | New Zealand |
| Whyte | 0-6-4T | 0-6-4T |
| Number in Class | 18 | 7 |
| Road Numbers | ||
| Gauge | 3'6" | 3'6" |
| Number Built | 18 | 7 |
| Builder | Avonside | Avonside |
| Year | 1878 | 1880 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 6.75 / 2.06 | 6.75 / 2.06 |
| Engine Wheelbase (ft / m) | 21.83 / 6.65 | 23.59 / 7.19 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.31 | 0.29 |
| Overall Wheelbase (engine & tender) (ft / m) | 21.83 / 6.65 | 23.59 / 7.19 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 38,080 / 17,273 | 51,072 / 23,166 |
| Engine Weight (lbs / kg) | 67,200 / 30,481 | 80,640 / 36,578 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | ||
| Tender Water Capacity (gals / ML) | 871 / 3.30 | 1394 / 5.28 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.80 / 2 | 1.60 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 21 / 10.50 | 28 / 14 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 36 / 914 | 36.50 / 927 |
| Boiler Pressure (psi / kPa) | 130 / 900 | 130 / 900 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12.25" x 16" / 311x406 | 13" x 16" / 330x406 |
| Tractive Effort (lbs / kg) | 7370 / 3342.98 | 8186 / 3713.11 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.17 | 6.24 |
| 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) | 12 / 1.12 | 14 / 1.30 |
| Evaporative Heating Surface (sq ft / m2) | 608 / 56.51 | 741 / 68.87 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 608 / 56.51 | 741 / 68.87 |
| Evaporative Heating Surface/Cylinder Volume | 278.57 | 301.46 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 1560 | 1820 |
| Same as above plus superheater percentage | 1560 | 1820 |
| Same as above but substitute firebox area for grate area | ||
| Power L1 | ||
| Power MT | ||