In 1939, the Lehigh Valley rebuilt all six of the Class S-1s. The three 25 x 28 cylinders were replaced with two 28 x 32 cylinders which reduced the tractive effort from 64,700 lbs to 61,811 lbs. The rebuilt locomotives weighed 370,000 pounds and were designated as Class S-2.
The Lehigh Valley retired the Class S-2s in 1948 and scrapped them shortly after.
Data from 1930 Locomotive Cyclopedia and LV 3 -1934 Locomotive Diagrams, the latter supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also "Lehigh Valley Three-Cylinder Locomotive", Railway Age, Volume 76, No (14 June 1924), pp. 1585=1586; and Alfred W Bruce, The Steam Locomotive in America (New York: Bonanza Books, 1952), pp. 201-201, 210. (Thanks to Chris Hohl for pointing out the mixed valve gear.)
Locobase shows the prototype S-1 three-cylinder engine, which is described in detail, including excellent diagrams, in the Railway Age article. The boilers held a great amount of evaporative and superheating areas, lots of firebox area, and a large grate.
Each of the three cylinders was fed through 11" (279 mm) piston valves. The right and center cylinder were cast together, the left cylinder was cast separately.
The LV bought five more a year later from Alco-Brooks (works numbers 66102-66106 in December 1924.)
In 1939, the road rebuilt the class at their Sayre, Pa shops as two 28 x 32 in cylinder engines. Although they remained in service throughout World War Two, the S-1s were never very satisfactory.,
The entire class was scrapped in December 1948.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | S-1 |
| Locobase ID | 208 |
| Railroad | Lehigh Valley (LV) |
| Country | USA |
| Whyte | 4-8-2 |
| Number in Class | 6 |
| Road Numbers | 5000-5005 |
| Gauge | Std |
| Number Built | 6 |
| Builder | Alco-Brooks |
| Year | 1924 |
| Valve Gear | Walschaert & Gresley |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 18.75 / 5.71 |
| Engine Wheelbase (ft / m) | 41.17 / 12.55 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.46 |
| Overall Wheelbase (engine & tender) (ft / m) | 77.67 / 23.67 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 61,700 / 27,987 |
| Weight on Drivers (lbs / kg) | 246,500 / 111,811 |
| Engine Weight (lbs / kg) | 369,000 / 167,376 |
| Tender Loaded Weight (lbs / kg) | 201,000 / 91,172 |
| Total Engine and Tender Weight (lbs / kg) | 570,000 / 258,548 |
| Tender Water Capacity (gals / ML) | 10,500 / 39.77 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 15 / 14 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 103 / 51.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 69 / 1753 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 25" x 28" / 635x711 (3) |
| Tractive Effort (lbs / kg) | 64,674 / 29335.67 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.81 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 230 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 50 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 21 / 6.40 |
| Firebox Area (sq ft / m2) | 392 / 36.43 |
| Grate Area (sq ft / m2) | 84.30 / 7.83 |
| Evaporative Heating Surface (sq ft / m2) | 4729 / 439.50 |
| Superheating Surface (sq ft / m2) | 1294 / 120.26 |
| Combined Heating Surface (sq ft / m2) | 6023 / 559.76 |
| Evaporative Heating Surface/Cylinder Volume | 198.20 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 16,860 |
| Same as above plus superheater percentage | 20,401 |
| Same as above but substitute firebox area for grate area | 94,864 |
| Power L1 | 17,674 |
| Power MT | 632.28 |
