Deutsche Bundesbahn 2-6-4 Locomotives in Germany
Class Details by Steve Llanso of Sweat House Media
Class BR 66 (Locobase 2460)
See data from [
] (June 2002), supplemented and amended by [], last accessed 14 May 2011.
Modest-sized mixed-traffic locomotives with Krauss-Helmholz trucks and a system that equalized flange wear on the leading truck and trailing bogie. Also featured a relatively short boiler and long combustion chamber.
Intended to replace older classes on passenger and fast-freight service, the two prototypes met the requirements quite well in testing. Their kit included the usual late-steam features: roller bearings on all axles, welded high-pressure boiler with combustion chamber and a mixer/preheater. The design also presented the two-man crew with a well-protected cab that included skylights and upholstered seats.
But by the time they were to be introduced, dieselization of such services was well underway in West Germany. So, although the two prototypes operated until 1968, they would be the only locomotives in their class.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | BR 66 |
| Locobase ID | 2460 |
| Railroad | Deutsche Bundesbahn |
| Country | Germany |
| Whyte | 2-6-4T |
| Number in Class | 2 |
| Road Numbers | BR 66 001-BR 66 002 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Henschel & Sohn |
| Year | 1955 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.14 / 3.70 |
| Engine Wheelbase (ft / m) | 36.25 / 11.05 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.33 |
| Overall Wheelbase (engine & tender) (ft / m) | 36.25 / 11.05 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 34,723 / 15,750 |
| Weight on Drivers (lbs / kg) | 103,838 / 47,100 |
| Engine Weight (lbs / kg) | 205,912 / 93,400 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 3775 / 14.30 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 58 / 29 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 63 / 1600 |
| Boiler Pressure (psi / kPa) | 232.10 / 1600 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18.5" x 25.98" / 470x660 |
| Tractive Effort (lbs / kg) | 27,844 / 12629.84 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.73 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 70 - 1.732" / 44 |
| Flues (number - dia) (in / mm) | 36 - 4.646" / 118 |
| Flue/Tube length (ft / m) | 11.81 / 3.60 |
| Firebox Area (sq ft / m2) | 122.66 / 11.40 |
| Grate Area (sq ft / m2) | 21.09 / 1.96 |
| Evaporative Heating Surface (sq ft / m2) | 941 / 87.46 |
| Superheating Surface (sq ft / m2) | 486 / 45.13 |
| Combined Heating Surface (sq ft / m2) | 1427 / 132.59 |
| Evaporative Heating Surface/Cylinder Volume | 116.42 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4895 |
| Same as above plus superheater percentage | 6559 |
| Same as above but substitute firebox area for grate area | 38,149 |
| Power L1 | 17,875 |
| Power MT | 1138.53 |