Lehigh Valley No. 708 to 712 and 753 to 772
Lehigh Valley classes J-42, J-43 and J-49 to J-52
Parallel to the five 4-4-0 with the numbers 659 to 663, the Lehigh Valley had five 4-6-0 built by Baldwin in 1895 and gave them the numbers 708 to 712. These were all Camelbacks and were nearly identical apart from the additional driving axle. They were completed by 20 other 4-6-0 with a slightly smaller boiler. The first of those also got a driver diameter of 68 inches, while the other 15 only had 62 inches.
Later when the new class scheme was adopted, they all got the prefix J, what denoted their wheel arrangement. The locomotives with 62 inch drivers were classed into class J-42, while the ones with 68 inches became class J-43. After rebuilds which changed boiler pressure and cylinder size, they were designated classes J-49 to J-52. The last ones were scrapped in 1930.
Technical data
General
| Property | 708-712 | 753-757 | 758-772 |
|---|---|---|---|
| Built | 1895 | 1896 | |
| Manufacturers | Baldwin | ||
| Wheel arrangement | 4-6-0 (Ten-wheeler) | ||
| Gauge | 1,435 mm (Standard gauge) | ||
Dimensions and weights
| Property | 708-712 | 753-757 | 758-772 |
|---|---|---|---|
| Wheelbase | 6.99 m | ||
| Service mass | 59 t | 61.7 t | |
| Adhesion mass | 45.4 t | 48.1 t | |
| Total mass | 97.1 t | 99.8 t | |
| Rigid wheelbase | 3.66 m | ||
| Axle load | 15.1 t | 16 t | |
| Water capacity | 15,142 l | ||
Boiler
| Property | 708-712 | 753-757 | 758-772 |
|---|---|---|---|
| Grate area | 6.225 m² | ||
| Firebox surface | 14.586 m² | 13.935 m² | |
| Tube heating surface | 163.324 m² | 159.05 m² | |
| Evaporative heating surface | 177.909 m² | 172.986 m² | |
| Total heating surface | 177.9 m² | 173.0 m² | |
Power plant
| Property | 708-712 | 753-757 | 758-772 |
|---|---|---|---|
| Driver diameter | 1,727 mm | 1,575 mm | |
| Boiler pressure | 11 bar | ||
| Expansion type | simple expansion | ||
| Cylinders | two, 508 x 610 mm | ||
Power
| Property | 708-712 | 753-757 | 758-772 |
|---|---|---|---|
| Power source | steam | ||
| Estimated power | 858 kW (1,167 PS) | 820 kW (1,115 PS) | |
| Starting effort | 85.4 kN | 93.7 kN | |
Calculated values
| Property | 708-712 | 753-757 | 758-772 |
|---|---|---|---|
| Factor of adhesion | 1 : 5.21 | 1 : 5.52 | 1 : 5.04 |
| Optimal speed | 61 km/h | 60 km/h | 53 km/h |
| Power-to-weight ratio | 14.6 kW/t | 13.3 kW/t | |
| Heating Surface Equivalent | 250.8 m² | 242.7 m² | |
| Cylinder volume/HSE | 1 : 985.13 | 1 : 1,018.34 | |
| Adhesive weight/Total | 1 : 1.30 | 1 : 1.28 | |
| Tractive force/Heating surface | 1 : 10.03 | 1 : 10.31 | 1 : 11.31 |
| Grate area/Heating surface | 1 : 28.58 | 1 : 27.79 | |
| Firebox/Tube surface | 1 : 11.20 | 1 : 11.41 | |