Richmond & Danville class 820
Southern Railway (USA) class F-1
In 1893 and 1894 the Richmond & Danville Railroad received a total of 14 ten-wheelers. Nine of these came from Baldwin and five from Richmond. The locomotives of the two manufacturers hardly differed, a small difference was the grate area of 27.9 and 28.2 square feet respectively.
One of the Baldwin locomotives was a Vauclain compound with four cylinders and a slightly higher boiler pressure. It was initially built with 14 and 24 inches diameter cylinders, but was rebuilt directly to 15 and 25 inches diameters.
When the Richmond & Danville was bought up by the Southern Railway in 1894, the locomotives were reclassified to the class F-1. Also in this class were other similar locomotives built directly for the Southern at about the same time. The scrapping of the 14 locomotives of the former class 820 took place between 1932 and 1939.
Technical data
General
| Property | simple | compound |
|---|---|---|
| Built | 1893-1894 | 1893 |
| Manufacturers | Baldwin, Richmond | Baldwin |
| Wheel arrangement | 4-6-0 (Ten-wheeler) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | simple | compound |
|---|---|---|
| Total wheelbase | 16.05 m | |
| Service mass | 61.2 t | |
| Adhesion mass | 48.5 t | |
| Total mass | 100.3 t | |
| Rigid wheelbase | 3.66 m | |
| Axle load | 16.2 t | |
Boiler
| Property | simple | compound |
|---|---|---|
| Grate area | 2.592 m² | 2.62 m² |
| Firebox surface | 12.356 m² | |
| Tube heating surface | 155.799 m² | |
| Evaporative heating surface | 168.155 m² | |
| Total heating surface | 168.2 m² | |
Power plant
| Property | simple | compound |
|---|---|---|
| Driver diameter | 1,676 mm | |
| Boiler pressure | 11.7 bar | 12.4 bar |
| Expansion type | simple expansion | compound |
| Cylinders | two, 508 x 610 mm | four, HP: 381 x 610 mm and LP: 635 x 610 mm |
Power
| Property | simple | compound |
|---|---|---|
| Power source | steam | |
| Estimated power | 522 kW (710 PS) | 559 kW (760 PS) |
| Starting effort | 93.5 kN | 81.9 kN |
| Starting effort simple | 98.3 kN | |
Calculated values
| Property | simple | compound |
|---|---|---|
| Factor of adhesion | 1 : 5.09 | 1 : 5.81 |
| Optimal speed | 34 km/h | 42 km/h |
| Power-to-weight ratio | 8.5 kW/t | 9.1 kW/t |
| Heating Surface Equivalent | 229.9 m² | |
| Cylinder volume/HSE | 1 : 1,074.70 | 1 : 1,444.13 |
| Adhesive weight/Total | 1 : 1.26 | |
| Tractive force/Heating surface | 1 : 11.61 | 1 : 10.17 |
| Grate area/Heating surface | 1 : 64.87 | 1 : 64.18 |
| Firebox/Tube surface | 1 : 12.61 | |
