Builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004. Works #3951-3953 in August 1901 and numbered 588-590, renumbered 591-593 soon thereafter. Cannot tell about the other two.
http://www.insighting.co.uk/homauchchunk/steam_class.htm for photos and further comments.
Locobase 5331 shows the sextet of Atlantics as they entered service in 1901. Unlike many of the other American railroads that operated 4-4-2s or Camelbacks, the CNJ held onto their doubly unusual P-6s until the end of steam. But the engines were quite different after a substantial makeover that included increasing piston diameter by 1 1/2" in cylinders supplied by 12" piston valves and reducing the driver diameter by 6 inches. At the same time, adhesion weight went up by more than 15 tons to handle the higher tractive effort. A reconfigured boiler substituted 24 flues (and their superheater elements) for 155 small tubes. Finally, the tender held more water and coal and weighed almost 15 tons more than its older counterpart.
| Specifications | ||
|---|---|---|
| Class | P-6 | P-6 superheated |
| Locobase ID | 5331 | 9447 |
| Railroad | Central RR of New Jersey | Central RR of New Jersey |
| Whyte | 4-4-2 | 4-4-2 |
| Road Numbers | 590-595 | 590-595 |
| Gauge | Std | Std |
| Builder | Brooks | CNJ |
| Year | 1901 | 1917 |
| Valve Gear | Stephenson | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 7.67' | 7.67' |
| Engine Wheelbase | 29.83' | 29.92' |
| Ratio of driving wheelbase to overall engine wheebase | 0.26 | 0.26 |
| Overall Wheelbase (engine & tender) | 53.67' | 58.54' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 99400 lbs | 127800 lbs |
| Engine Weight | 191000 lbs | 215700 lbs |
| Tender Light Weight | 124000 lbs | 153800 lbs |
| Total Engine and Tender Weight | 315000 lbs | 369500 lbs |
| Tender Water Capacity | 7500 gals | |
| Tender Fuel Capacity (oil/coal) | 13 tons | |
| Minimum weight per yard of rail on which locomotive could run | 83 lb rail | 107 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 85" | 79" |
| Boiler Pressure | 210 psi | 210 psi |
| Cylinders (dia x stroke) | 20.5" x 26" | 22" x 26" |
| Tractive Effort | 22946 lbs | 28433 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.33 | 4.49 |
| Heating Ability | ||
| Firebox Area | 174 sq. ft | 173.90 sq. ft |
| Grate Area | 82 sq. ft | 81.63 sq. ft |
| Evaporative Heating Surface | 2967 | 2188 |
| Superheating Surface | 460 | |
| Combined Heating Surface | 2967 | 2648 |
| Evaporative Heating Surface/Cylinder Volume | 298.72 | 191.27 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 17220 | 17142 |
| Same as above plus superheater percentage | 17220 | 20571 |
| Same as above but substitute firebox area for grate area | 36540 | 43823 |
| Power L1 | 11493 | 17397 |
| Power MT | 509.81 | 600.22 |
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