Data from DeGolyer, Vol 66, pp. 415+ and Vol 79, pp. 418+. Works numbers were 55089-55098 in September 1921; 56379, 56381-56386, 56425-56431, 56454-56464
in April 1923; 61118-61122 in November 1929; and 61798-61807 in November 1934.
These metre-gauge mixed-traffic Mikados were headed for a railway that had maximum curves of 3% and curves with radii of 70 metres (230 feet) or 25 degrees. Steam admission came through 254 mm (10 inch) piston valves. Apparently, the engines were at least very satisfactory the class eventually numbered 50 locomotives.
After the 1921 delivery, the CSR requested a few changes. Both inner drivers were to be fitted with plain tires (i.e. no flanges) and the area between the fingers of the grate bars was too wide and the railway wanted them "materially reduced".
Charles R Cullen, Baldwin's Santiago, Chile office manager, also noted that the CSR wanted extended piston rods for these engines. "This in spite of what we told him that we did not consider it good practice in this size cylinder, "he minuted", but he wanted them as he had them on all the locos on the railways."
The 1923 order allowed an additional 500 kg (1,101 lb) of axle loading, which may have reflected the inclusion of a Worthington feed water heated rated at 2,400 US gallons (9,084 litres) per hour. Later orders in 1929 and 1934 repeated the specs with minor weight variations and slightly larger tenders.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 79, pp. 326+. Works numbers were 61106-61117 in November 1929.
Interesting "Hereafter" note concerning the two-unit Nicholson thermic syphon, which added 4.7 sq m (50.6 sq ft), appeared in the specs. "Raise question about locating syphons toward center of boiler so that syphons will not interfere with application of radial stays. It may be necessary to omit the center fire brick tube and apply wider fire brick."
The class was fitted with Worthington feed water heaters and 305 mm (12") piston valves.
Data from DeGolyer, Volume 82, pp. 689+ and "Seven Mountain Type Locomotives for Chile", Baldwin Magazine, Volume 17, No 2 (October 1938), pp. 21-23. (Many thanks to Victor Lobo for his 10 October 2021 email with a YouTube link--
[]--- that runs 25 minutes and features restored and operational 820.) Works numbers were 62241-62247 in February 1937, 62422-62426 in 1940.
These were slightly heavier engines than the 1929 broad-gauge Mountains (Locobase 14356) that were pushing the boundaries of a4xle loading. The measures taken to accommodate a 13 mm (1/2 inch) increase in cylinder diameter, as well as a slight reduction in the two-unit thermic syphon area to 4.27 sq m (46 sq ft) suggest how tight the margins were. The design also had a Worthington feed water heater, Chambers front-end throttle, Security brick arch, Detroit lubricator, Nathan Simplex injector.
A note in the 1937 specs lays out the adjustments: "Change in cylinders dia. will increase maximum tractive power and in order to keep the ratio of adhesion to approximately what it is on the present locos. it will be necessary to increase the weight on drivers. This can be accomplished by changing the trailer equalizer pin locations."
Interesting "Hereafter" note concerning the two-unit Nicholson thermic syphon, which added 4.7 sq m (50.6 sq ft), appeared in the specs. "Raise question about locating syphons toward center of boiler so that syphons will not interfere with application of radial stays. It may be necessary to omit the center fire brick tube and apply wider fire brick."
See also the long letter from C G Pinney beginning on page 701 of the specifications book about the ups-and-downs of the initial service period. It all came out well, at least for the 819, when it capped its trial runs by rescuing a train hauled by a broken-down German-built engine. Having delivered all safely to Rancagua, the 819 pulled a 450 metric ton train back to Santiago "without difficulty."
(Baldwin's account noted that in addition to many steam locomotives "of many types", the company had partnered with Westinghouse in the constrruction of 43 electric locomotives operating between Valparaiso and Santiago.)
Principal Dimensions by Steve Llanso of Middle Run Media | |||
---|---|---|---|
Class | 3501 | 801 | 813 |
Locobase ID | 14355 | 14356 | 14357 |
Railroad | Chilean State | Chilean State | Chilean State |
Country | Chile | Chile | Chile |
Whyte | 4-8-2 | 4-8-2 | 4-8-2 |
Number in Class | 50 | 12 | 12 |
Road Numbers | 3501-3550 | 801-812 | 813-824 |
Gauge | Metre | 5'6" | 5'6" |
Number Built | 50 | 12 | 12 |
Builder | Baldwin | Baldwin | Baldwin |
Year | 1921 | 1929 | 1937 |
Valve Gear | Walschaert | Walschaert | Walschaert |
Locomotive Length and Weight | |||
Driver Wheelbase (ft / m) | 12.01 / 3.66 | 17.50 / 5.33 | 17.50 / 5.33 |
Engine Wheelbase (ft / m) | 26.35 / 8.03 | 38.17 / 11.63 | 38.17 / 11.63 |
Ratio of driving wheelbase to overall engine wheelbase | 0.46 | 0.46 | 0.46 |
Overall Wheelbase (engine & tender) (ft / m) | 51.88 / 15.81 | 65.79 / 20.05 | 65.79 / 20.05 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 26,455 / 12,000 | 37,699 / 17,100 | 39,595 / 17,960 |
Weight on Drivers (lbs / kg) | 105,822 / 48,000 | 148,999 / 67,585 | 151,998 / 68,945 |
Engine Weight (lbs / kg) | 139,354 / 63,210 | 242,998 / 110,222 | 236,994 / 107,499 |
Tender Loaded Weight (lbs / kg) | 90,389 / 41,000 | 135,000 / 61,235 | 128,750 / 58,400 |
Total Engine and Tender Weight (lbs / kg) | 229,743 / 104,210 | 377,998 / 171,457 | 365,744 / 165,899 |
Tender Water Capacity (gals / ML) | 4488 / 17 | 6996 / 26.50 | 6996 / 26.50 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 7.70 / 7 | 8.80 / 8 | 8.80 / 8 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 44 / 22 | 62 / 31 | 63 / 31.50 |
Geometry Relating to Tractive Effort | |||
Driver Diameter (in / mm) | 43.50 / 1105 | 66 / 1676 | 66 / 1676 |
Boiler Pressure (psi / kPa) | 169.70 / 1170 | 204.50 / 1410 | 204.50 / 1410 |
High Pressure Cylinders (dia x stroke) (in / mm) | 19.49" x 22.05" / 495x560 | 22.01" x 27.99" / 559x711 | 22.52" x 27.99" / 572x711 |
Tractive Effort (lbs / kg) | 27,774 / 12598.09 | 35,712 / 16198.71 | 37,386 / 16958.02 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.81 | 4.17 | 4.07 |
Heating Ability | |||
Tubes (number - dia) (in / mm) | 132 - 2.008" / 51 | 161 - 2.008" / 51 | 161 - 2.008" / 51 |
Flues (number - dia) (in / mm) | 24 - 5.394" / 137 | 28 - 5.394" / 137 | 28 - 5.394" / 137 |
Flue/Tube length (ft / m) | 14.01 / 4.27 | 20.51 / 6.25 | 20.51 / 6.25 |
Firebox Area (sq ft / m2) | 121.63 / 11.30 | 285.35 / 26.51 | 280.73 / 26.08 |
Grate Area (sq ft / m2) | 31.43 / 2.92 | 52.31 / 4.86 | 52.31 / 4.86 |
Evaporative Heating Surface (sq ft / m2) | 1584 / 147.18 | 2811 / 261.17 | 2807 / 260.74 |
Superheating Surface (sq ft / m2) | 375 / 34.80 | 667 / 61.98 | 667 / 61.96 |
Combined Heating Surface (sq ft / m2) | 1959 / 181.98 | 3478 / 323.15 | 3474 / 322.70 |
Evaporative Heating Surface/Cylinder Volume | 208.04 | 228.06 | 217.53 |
Computations Relating to Power Output (More Information) | |||
Robert LeMassena's Power Computation | 5334 | 10,697 | 10,697 |
Same as above plus superheater percentage | 6347 | 12,730 | 12,730 |
Same as above but substitute firebox area for grate area | 24,562 | 69,441 | 68,317 |
Power L1 | 8996 | 18,690 | 17,805 |
Power MT | 749.66 | 1106.16 | 1032.99 |