Adriatico / FS 2-6-0 Locomotives in Italy
Class Details by Steve Llanso of Sweat House Media
Class Series 400 / Gruppo 630 (Locobase 9188)
Data from Dr. R. Sanzin, "Die Lokomotiven auf der Intertionalen Austellung in Mailand 1906, 8. 3/4 gekuppelte zweizylindrige Verbund-fschnellzuglokomotive der italienischen Staatsbahnen ...", Zeitschrift des Oesterreichischen Ingenieur- und Architeckten-Vereines, Vol LVIII Nr. 50 (14 December 1906), p 699-700. See also Maurice Demoulin, Locomotive Actuelle ... (Paris: Librairie Polytechnique Ch.Beranger, 1906), p. 269 and [
].
This set of Moguls had a surprisingly tall set of drivers, but they were intended for the Bologna-Porreta and Foggia-Naples expresses. And they had a relatively modest axle loading to contend with. The design that resulted used the Zara truck (Sanzin says Krauss-Helmholz) that combined the Bissel truck with the first coupled axle. Inside the boiler were Serve tubes, the large-diameter firetubes that were fitted with internal fins.
According to "La ferrovia Ellera Tavernelle: La locomotiva a vapore del gruppo FS 640" (located at the website [], accessed 10 February 208), the 630s were successful, but certain route profiles weren't suited to compound operation and their operation was complicated.
The Gruppo 640 Moguls (Locobase 2475), which had a simple-expansion system and a superheater, were derived from these compound Moguls.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Series 400 / Gruppo 630 |
| Locobase ID | 9188 |
| Railroad | Adriatico / FS |
| Country | Italy |
| Whyte | 2-6-0 |
| Number in Class | 100 |
| Road Numbers | 6301-6400 |
| Gauge | Std |
| Number Built | 100 |
| Builder | |
| Year | 1906 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.78 / 4.20 |
| Engine Wheelbase (ft / m) | 22.15 / 6.75 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.62 |
| Overall Wheelbase (engine & tender) (ft / m) | 44.88 / 13.68 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 33,069 / 15,000 |
| Weight on Drivers (lbs / kg) | 97,003 / 44,000 |
| Engine Weight (lbs / kg) | 121,254 / 55,000 |
| Tender Loaded Weight (lbs / kg) | 75,398 / 34,200 |
| Total Engine and Tender Weight (lbs / kg) | 196,652 / 89,200 |
| Tender Water Capacity (gals / ML) | 3960 / 15 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.60 / 6 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 54 / 27 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 71.30 / 1810 |
| Boiler Pressure (psi / kPa) | 226.30 / 1560 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16.93" x 27.56" / 430x700 (1) |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 26.77" x 27.56" / 680x700 (1) |
| Tractive Effort (lbs / kg) | 15,223 / 6905.04 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.37 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 104 - 2.756" / 70 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13.12 / 4 |
| Firebox Area (sq ft / m2) | 107.64 / 10 |
| Grate Area (sq ft / m2) | 25.83 / 2.40 |
| Evaporative Heating Surface (sq ft / m2) | 1862 / 173 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1862 / 173 |
| Evaporative Heating Surface/Cylinder Volume | 518.61 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5845 |
| Same as above plus superheater percentage | 5845 |
| Same as above but substitute firebox area for grate area | 24,359 |
| Power L1 | 7190 |
| Power MT | 490.23 |