Data from Gavin Hamilton's excellent compilation of Garratt data posted at [] (6 September 2005); and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p. 170 Works numbers were 7308-7313 in 1949.
Double Mountain Garratts that began as metre-gauge engines and were based on the wartime light Garratt that served several railways (Locobase 511). The railway and the locomotives were later converted to the Cape gauge.
Althuogh retired in the early 70s, the entire class survived the Angolan War of Independence in storage . Five of the class were scrapped in October 2019.
Data from Gavin Hamilton's excellent compilation of Garratt data posted at []
(6 September 2005). See also Dr Dirk Forschner, "The contribution of the German locomotive industry to the progress of traction
for the Portuguese railways from 1855 - 1931, an observation from
contemporary sources at [], last accessed on 12 December 2022. Works numbers were 2493-2498 in 1954.
"In 1954, Krupp received a Portuguese order in Essen to build a series of six Garratt
type double mountain locomotives for the Luanda Railway in meter gauge", wrote Forschner. They were "not only among the largest locomotives for Krupp AG in Essen, but also among the largest locomotives supplied to Portugal ...The locomotive frame was designed as a cast steel bar frame ...This state-of-the-art engine was equipped with electric lighting and a feed water preheating system."
They remained in service into the early 70s, then were placed on sidings..After gradually rusting away, 553 and 555-556 went to the scrapyard in October 2010.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | 501 | 551 |
Locobase ID | 525 | 526 |
Railroad | Luanda Railway | Luanda Railway |
Country | Angola | Angola |
Whyte | 4-8-2+2-8-4 | 4-8-2+2-8-4 |
Number in Class | 6 | 6 |
Road Numbers | 501-506 | 2493-2498 |
Gauge | Metre | Metre |
Number Built | 6 | 6 |
Builder | Beyer, Peacock | Krupp |
Year | 1949 | 1954 |
Valve Gear | Walschaert | Walschaert |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | ||
Engine Wheelbase (ft / m) | ||
Ratio of driving wheelbase to overall engine wheelbase | ||
Overall Wheelbase (engine & tender) (ft / m) | ||
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 25,200 / 11,431 | 29,120 / 13,209 |
Weight on Drivers (lbs / kg) | 201,600 / 91,444 | 228,480 / 103,637 |
Engine Weight (lbs / kg) | 333,760 / 151,391 | 366,240 / 166,124 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | ||
Tender Water Capacity (gals / ML) | 6600 / 25 | 8460 / 32.05 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 9.70 / 9 | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 42 / 21 | 48 / 24 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 48 / 1219 | 43 / 1092 |
Boiler Pressure (psi / kPa) | 204.50 / 1410 | 204.50 / 1410 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 (4) | 18.5" x 21.62" / 470x549 (4) |
Tractive Effort (lbs / kg) | 44,499 / 20184.43 | 59,824 / 27135.74 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.53 | 3.82 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | ||
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | ||
Firebox Area (sq ft / m2) | 215 / 19.98 | 253 / 23.51 |
Grate Area (sq ft / m2) | 48.75 / 4.53 | 48.90 / 4.54 |
Evaporative Heating Surface (sq ft / m2) | 1994 / 185.32 | 1979 / 183.92 |
Superheating Surface (sq ft / m2) | 370 / 34.39 | 545 / 50.65 |
Combined Heating Surface (sq ft / m2) | 2364 / 219.71 | 2524 / 234.57 |
Evaporative Heating Surface/Cylinder Volume | 178.51 | 147.11 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 9969 | 10,000 |
Same as above plus superheater percentage | 11,564 | 12,200 |
Same as above but substitute firebox area for grate area | 51,002 | 63,121 |
Power L1 | 9372 | 8878 |
Power MT | 819.91 | 685.32 |