Data from [], the web site of the Spanish National Railway and [] The latter reproduces the diagrama with all weights and dimensions as well as a photograph.
Photographs show these express locomotives to have resembled the British Merchant Navy class Pacific in their air-smoothing casings, but the MZA engines were smaller and smaller drivers. Pere Comas, whose Paleontologia Vaporosa posts on the family tree of Spanish 4-8-0s are referenced in Locobase 3382, identifies this elaboration of the earlier species "Montagna Regina" (Locobase 3392) as "Montagna Velocipedus". The principal difference was the highly pressed boiler, which was intended to generate more power within the same dimensions. Comas notes that the Civil War, the war in Europe, and postwar (i.e., 1939 and later) isolation threw up barriers to MTM's acquisition of the appropriate steel and special lubricants. Nevertheless, the company delivered the ten locomotives in 1939 and, he adds, the bad omens that had weighed on the project from its birth were fulfilled.
Principal Dimensions by Steve Llanso of Sweat House Media | ||
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Class | 1701/241-2001 | 1801/241-2101 |
Locobase ID | 3392 | 3393 |
Railroad | Madrid, Zaragoza & Alicante (MZA) | Madrid, Zaragoza & Alicante (MZA) |
Country | Spain | Spain |
Whyte | 4-8-2 | 4-8-2 |
Number in Class | 95 | 10 |
Road Numbers | 1701-1795/241-2001 a 241-2095 | 1801-1810/241-2101 a 241-2110 |
Gauge | 5'6" | 5'6" |
Number Built | 95 | 10 |
Builder | MTM | MTM |
Year | 1927 | 1939 |
Valve Gear | Walschaert | Dabeg |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 18.21 / 5.55 | 18.21 / 5.55 |
Engine Wheelbase (ft / m) | 40.85 / 12.45 | 40.85 / 12.45 |
Ratio of driving wheelbase to overall engine wheelbase | 0.45 | 0.45 |
Overall Wheelbase (engine & tender) (ft / m) | 65.62 / 20 | 70.87 / 21.60 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 42,439 / 19,250 | |
Weight on Drivers (lbs / kg) | 146,034 / 66,240 | 169,756 / 77,000 |
Engine Weight (lbs / kg) | 235,762 / 106,940 | 259,043 / 117,500 |
Tender Loaded Weight (lbs / kg) | 124,561 / 56,500 | 166,669 / 75,600 |
Total Engine and Tender Weight (lbs / kg) | 360,323 / 163,440 | 425,712 / 193,100 |
Tender Water Capacity (gals / ML) | 6500 / 24.62 | 8321 / 31.52 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.60 / 6 | 11 / 10 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 61 / 30.50 | 71 / 35.50 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 68.90 / 1750 | 68.90 / 1750 |
Boiler Pressure (psi / kPa) | 203.10 / 14 | 290.10 / 20 |
High Pressure Cylinders (dia x stroke) (in / mm) | 24.4" x 27.95" / 620x710 | 22.05" x 27.95" / 560x710 |
Tractive Effort (lbs / kg) | 41,694 / 18912.10 | 48,635 / 22060.49 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.50 | 3.49 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 163 - 1.97" / 50 | 148 - 1.969" / 50 |
Flues (number - dia) (in / mm) | 34 - 5.25" / 133 | 28 - 5.236" / 133 |
Flue/Tube length (ft / m) | 19 / 5.79 | 19 / 5.79 |
Firebox Area (sq ft / m2) | 206.59 / 19.20 | 206.59 / 19.20 |
Grate Area (sq ft / m2) | 53.37 / 4.96 | 53.80 / 5 |
Evaporative Heating Surface (sq ft / m2) | 2483 / 230.76 | 2214 / 205.80 |
Superheating Surface (sq ft / m2) | 968 / 89.96 | 1248 / 116 |
Combined Heating Surface (sq ft / m2) | 3451 / 320.72 | 3462 / 321.80 |
Evaporative Heating Surface/Cylinder Volume | 164.15 | 179.23 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 10,839 | 15,607 |
Same as above plus superheater percentage | 13,874 | 21,226 |
Same as above but substitute firebox area for grate area | 53,707 | 81,507 |
Power L1 | 18,854 | 39,046 |
Power MT | 1138.53 | 2028.36 |