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. 40. Works numbers 189-190 in 1930.
Double Prairie Garratts for a mining railroad in the Basque region of Spain. Designed by a local builder according to Beyer, Peacock's patent layout, this pair had Belpaire fireboxes, The railway opened in 1907 and had 205 kilometers of track. Soon after the Garratts arrived, the mine closed in 1932 and didn't reopen until 1941
Durrant visited this line in 1962. He saw the Garratt pulling hopper cars from Teruel to Escanton. On the heavier grades, a SM Mallet locomotive coupled on to the rear as a banking (North American "pusher") engine. After cresting the line's summit, the articulateds gave way to a North British Locomotive Company-built 4-8-0.
On the return trip, the odd couple (as he regarded the setup) would double-head a train of empties back to Teruel. In the later 1960s, the Mallets had been retired and the SM's Garratts teamed up with SM Mastodontes in the same service.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | 501 |
Locobase ID | 780 |
Railroad | Compania Minera de Sierra Menera |
Country | Spain |
Whyte | 2-6-2+2-6-2 |
Number in Class | 2 |
Road Numbers | 501-502 |
Gauge | Metre |
Number Built | 2 |
Builder | Euskalduna |
Year | 1930 |
Valve Gear | 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) | 31,808 / 14,428 |
Weight on Drivers (lbs / kg) | 186,928 / 84,789 |
Engine Weight (lbs / kg) | 264,656 / 120,046 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | 4224 / 16 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 7.60 / 7 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 52 / 26 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 42.80 / 1087 |
Boiler Pressure (psi / kPa) | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 22" / 432x559 (4) |
Tractive Effort (lbs / kg) | 45,457 / 20618.97 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.11 |
Heating Ability | |
Tubes (number - dia) (in / mm) | |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | |
Firebox Area (sq ft / m2) | 172 / 15.99 |
Grate Area (sq ft / m2) | 41.90 / 3.89 |
Evaporative Heating Surface (sq ft / m2) | 2007 / 186.52 |
Superheating Surface (sq ft / m2) | 448 / 41.64 |
Combined Heating Surface (sq ft / m2) | 2455 / 228.16 |
Evaporative Heating Surface/Cylinder Volume | 173.63 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 7542 |
Same as above plus superheater percentage | 8900 |
Same as above but substitute firebox area for grate area | 36,533 |
Power L1 | 7663 |
Power MT | 542.26 |