London & North Western 0-8-4 Locomotives in Great_Britain
Class Details by Steve Llanso of Sweat House Media
Class 380 (Locobase 2203)
Data from [
] (10 May 2003 -- the website of the London & North Western Railway Society's Goods Locomotives "exhibit"
The heaviest L&NWR engines built, these used the G2's boiler and firebox but fitted a 4-wheel trailing truck under the rear of the frame. This is the only class designed and built by Capt HPM Beames before the L&NWR disappeared in the grouping of 1923. As the LMS Class 7F, they ran until 1944-1951.
Chris Northedge of the L&NWRS Goods Locomotives exhibit explains that Beames wanted a tank-engine version of the 0-8-0s for short-haul, heavy-goods trains. His design spent most of its years in "the valleys of South Wales," says Northedge, "where most LNW lines could be classified as steeply graded, but some were positively ferocious: the climb to the Heads of the valleys from Abergavenny being at 1 in 38 [2.6%] and sharply curved!"
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 380 |
| Locobase ID | 2203 |
| Railroad | London & North Western |
| Country | Great Britain |
| Whyte | 0-8-4T |
| Number in Class | 30 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 30 |
| Builder | L&NW - Crewe |
| Year | 1923 |
| Valve Gear | Joy |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 17.25 / 5.26 |
| Engine Wheelbase (ft / m) | 29.25 / 8.92 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.59 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 150,080 / 68,075 |
| Engine Weight (lbs / kg) | 197,120 / 89,412 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 197,120 / 89,412 |
| Tender Water Capacity (gals / ML) | 2436 / 9.23 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.90 / 4 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 63 / 31.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 53 / 1346 |
| Boiler Pressure (psi / kPa) | 185 / 1280 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.5" x 24" / 521x610 |
| Tractive Effort (lbs / kg) | 29,925 / 13573.77 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.02 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 147 / 13.66 |
| Grate Area (sq ft / m2) | 23.60 / 2.19 |
| Evaporative Heating Surface (sq ft / m2) | 1687 / 156.78 |
| Superheating Surface (sq ft / m2) | 360 / 33.46 |
| Combined Heating Surface (sq ft / m2) | 2047 / 190.24 |
| Evaporative Heating Surface/Cylinder Volume | 184.00 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4366 |
| Same as above plus superheater percentage | 5152 |
| Same as above but substitute firebox area for grate area | 32,090 |
| Power L1 | 10,092 |
| Power MT | 592.99 |