The first "Mikado" type locomotives on the CNJ were the ten USRA "Mikado-Heavy" locomotives which arrived in 1918. This group was built by the American Locomotive Company and was designated as Class M-1 and carried road numbers 850 through 859. They had 63" diameter drivers, 27" x 32" cylinders, a 190 psi boiler pressure, exerted 59,800 pounds of tractive effort and each weighed 320,000 pounds. The firebox was 307 square feet. The Evaporative heating surface was 4,293 square feet and with the superheater the combined heating surface was 5,286 square feet.
In 1920, ALCO delivered eleven "Mikados" which were designated as Class M-2 and given road number 860 through 870 and another twenty-five in 1922 which were designated as Class M-2c and assigned road numbers 871 through 895.
In 1923, another twenty 2-8-2s came from ALCO. This group was designated as Class M-3 and was assigned road numbers 896 through 915. After buying sixty-six 2-8-2s from ALCO the last group the CNJ would buy was bought form the Baldwin Locomotive Works. These twenty locomotives were designated as M-3a and carried road numbers 916 through 1925
There are no surviving Central Railroad of New Jersey 2-8-2 "Mikado" type locomotives.
| Class | Later Class | Qty. | Road Numbers | Year Built | Builder | Notes |
|---|---|---|---|---|---|---|
| M-1 | M-63 | 10 | 850-859 | 1918 | ALCO | 1 |
| M-2 | M-63 | 11 | 860-870 | 1920 | ALCO | 2 |
| M-2a | M-63 | 25 | 871-895 | 1922 | ALCO | 3 |
| M-3 | M-63 | 20 | 896-915 | 1923 | ALCO | 4 |
| M-3a | M-63 | 20 | 916-935 | 1925 | Baldwin | 5 |
Data from table in 1930 Locomotive Cyclopedia and CNJ 7 - 1944 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 69, pp. 35+. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error .) Alco-Brooks works numbers were 59730-59739 in August 1918 (M-1s); 61010 in March 1920, 61011-61020 in April (M-2s); and 63219-63243 in March 1920. 63219-
63243 in March 1922 (M-2as). Alco-Schenectady works numbers 64204-64213 in May 1923 and 64714-64723 in August (M-3s). Baldwin works numbers 58273-58274 and 58293-58304 in March 1925, 58404-58409 in May.
The large stud of Mikes arrived over a five-year period, but were essentially identical as designed.
Firebox had combustion chamber that contributed 53 sq ft (4.9 sq m) to direct heating surface, boiler had Superheater Company (Elesco) feed water heater, piston valves measured 14" (356 mm) in diameter. Virtually identical to USRA Heavy Mikado (Locobase 41) but with a wide firebox for anthracite coal.
Many were later fitted with thermic syphons and two arch tubes, which increased the firebox heating surface to 430 sq ft (39.95 sq m) and total heating surface to 5,486 sq ft (509.67 sq m).
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | M-2/2as/3/3as / M-63 |
| Locobase ID | 5 |
| Railroad | Central RR of New Jersey |
| Country | USA |
| Whyte | 2-8-2 |
| Number in Class | 76 |
| Road Numbers | 860-935 |
| Gauge | Std |
| Number Built | 76 |
| Builder | several |
| Year | 1920 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 16.50 / 5.03 |
| Engine Wheelbase (ft / m) | 37.10 / 11.31 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 76.70 / 23.38 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 254,010 / 115,217 |
| Engine Weight (lbs / kg) | 340,510 / 154,453 |
| Tender Loaded Weight (lbs / kg) | 188,400 / 85,457 |
| Total Engine and Tender Weight (lbs / kg) | 528,910 / 239,910 |
| Tender Water Capacity (gals / ML) | 12,000 / 45.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 17 / 16 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 106 / 53 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 63 / 1600 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 27" x 32" / 686x813 |
| Tractive Effort (lbs / kg) | 62,949 / 28553.22 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.04 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 247 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 45 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 19 / 5.79 |
| Firebox Area (sq ft / m2) | 357 / 33.17 |
| Grate Area (sq ft / m2) | 94.80 / 8.81 |
| Evaporative Heating Surface (sq ft / m2) | 4335 / 402.73 |
| Superheating Surface (sq ft / m2) | 994 / 92.34 |
| Combined Heating Surface (sq ft / m2) | 5329 / 495.07 |
| Evaporative Heating Surface/Cylinder Volume | 204.38 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 18,960 |
| Same as above plus superheater percentage | 22,562 |
| Same as above but substitute firebox area for grate area | 84,966 |
| Power L1 | 14,917 |
| Power MT | 517.87 |
