Data is from Wiener (1930) and from Gavin Hamilton's compilation of Garratt data posted at [] (last accessed 6 September 2005); and "Assam Bengal Railway-Design 1127", Beyer-Garrrat Patent Articulated Locomotives (Manchester, England: Beyer-Peacock & Company Limited, 1931), archived on flickr's Historical Railway Images at [
], et seq, p. 28. Information about the class supplied in Coronel Gustavo Adolfo Tama'o, "Las Locomotoras Garratt en Argentina," in PDF. (Thanks to Carlo Bernasconi for his 22 October 2021 email correcting the railway's gauge.) Works numbers were 6238-6240 and 6349-6352 in 1925.
Ferrocarril General Urquiza. This septet of Double Mogul Garratts was the first of the type to come onto an Argentine railway.
Coronel Tamano commented that this class, which had the typical deep Belpaire firebox and big boiler barrel, had drivers of a size suited to freight and mixed-traffic trains. Tamano explained the reason for choosing a Garratt. To translate and paraphrase: : The light right-of-way, seated on a unsteady "mesopotamian" floor, that ran over an undulating topography that obliged the line constantly to conquer grades had certainly represented the fundamental factors in choosing the design. Sure enough, reported the Colonel, the combination of relatively high power on a light axle loading proved equal to the task.
B-P's 1931 report quoted from a 1927 report of the FCNEA's Directors that noted "these powerful units have exceeded expectations. At present (1927) they are employed between Concordia and Monte Caseros and the substantially heavier trains now hauled on that section have resulted in an appreciable economy in running costs." Four more followed, helping to compile a coal economy record that contrasted the 3.02 kilos consumed by these Garratts to move 100 ton-kilometres with the earlier 2-6-0s that burned 3.83 kilos to achieve the same--a 21.15% improvement." (For North Americans,
Data from Gavin Hamilton's excellent compilation of Garratt data posted at [] (6 September 2005). See also "Dundee Coal Co., Ltd. South Africa-Design 1118", Beyer-Garrrat Patent Articulated Locomotives (Manchester, England: Beyer-Peacock & Company Limited, 1931), archived on flickr's Historical Railway Images at [
], et seq, p. 52. (Thanks to Carlo Bernasconi for his 22 October 2021 email correcting the railway's gauge.)
Standard-gauge Double Mogul Garratts(works # 6645-6647) for the Entre Rios & North Eastern Railway, which later was part of Ferrocarril General Urquiza. Belpaire firebox heating surface included 20 sq ft (1.86 m) of arch tubes.
Locobase adopts the tube & flue length, number, and diameters from the 4-4-2+2-4-4s that were supplied to the FCER three years earlier (Locobase 568).
This set was clearly a combination of the earlier locomotive's firebox and boiler to a slow-freight configuration that featured a greater percentage of engine weight allocated to adhesion and lower drivers for more tractive effort. Water tankage and coal bunkerage dropped considerably as well.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | 101 | 201 |
Locobase ID | 527 | 528 |
Railroad | FC Noreste Argentino (FCNEA) | FC Noreste Argentino (FCNEA) |
Country | Argentina | Argentina |
Whyte | 2-6-0+0-6-2 | 4-4-2+2-4-4 |
Number in Class | 7 | 3 |
Road Numbers | 101-103, 104-107 | 201-203 |
Gauge | Std | Std |
Number Built | 7 | 3 |
Builder | Beyer, Peacock | Beyer, Peacock |
Year | 1925 | 1930 |
Valve Gear | Walschaert | Walschaert |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 12.85 / 3.92 | 23.34 / 7.11 |
Engine Wheelbase (ft / m) | 63.10 / 19.23 | 45 / 13.72 |
Ratio of driving wheelbase to overall engine wheelbase | 0.20 | 0.52 |
Overall Wheelbase (engine & tender) (ft / m) | 73.17 / 22.30 | 65 / 19.81 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 26,208 / 11,888 | 26,320 / 11,939 |
Weight on Drivers (lbs / kg) | 164,640 / 74,680 | 156,352 / 70,920 |
Engine Weight (lbs / kg) | 217,616 / 98,709 | 202,720 / 91,952 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | ||
Tender Water Capacity (gals / ML) | 3000 / 11.36 | 2400 / 9.09 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.50 / 4.10 | 3 / 2.70 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 46 / 23 | 65 / 32.50 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 45.50 / 1156 | 45 / 1143 |
Boiler Pressure (psi / kPa) | 184.20 / 1270 | 184.20 / 1270 |
High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 22" / 381x559 (4) | 15" x 22" / 381x559 (4) |
Tractive Effort (lbs / kg) | 34,067 / 15452.55 | 34,445 / 15624.01 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.83 | 4.54 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 172 - 1.835" / 47 | 172 - 1.85" / 47 |
Flues (number - dia) (in / mm) | 24 - 5.25" / 133 | 14 - 5.25" / 133 |
Flue/Tube length (ft / m) | 10.93 / 3.33 | 10.92 / 3.33 |
Firebox Area (sq ft / m2) | 152 / 14.12 | 172 / 15.98 |
Grate Area (sq ft / m2) | 34.40 / 3.20 | 34.40 / 3.20 |
Evaporative Heating Surface (sq ft / m2) | 1480 / 137.50 | 1487 / 138.15 |
Superheating Surface (sq ft / m2) | 300 / 27.87 | 270 / 25.08 |
Combined Heating Surface (sq ft / m2) | 1780 / 165.37 | 1757 / 163.23 |
Evaporative Heating Surface/Cylinder Volume | 164.46 | 165.23 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 6336 | 6336 |
Same as above plus superheater percentage | 7414 | 7287 |
Same as above but substitute firebox area for grate area | 32,758 | 36,435 |
Power L1 | 7668 | 7333 |
Power MT | 616.07 | 413.59 |