Camden & Amboy 6-2-0 "Crampton" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class John Stevens (Locobase 4834)

Worked out by president Robert Stevens and CME Isaac Dripps, this Crampton-like express engine was of such bizarre appearance as to be instantly recognizable. As with the Cramptons, the goal was to use very tall drivers for great speed (96" for five of them, 84" for the others) but to keep the center of gravity low. The result was a narrow, low-slung boiler leading a large anthracite-burning firebox.mounted so low that the fireman stood just 18" (457 mm) above the road bed throwing coal into a fire hole at the height of his ankles. Grate area was much too small, particularly in view of the anthracite fuel being used.

The rest of the design was equally unconventional. Three leading axles rode in a bogie positioned behind the smokebox and under the dual-tapered dome. So located, the bogie took more of the load than the drivers. The long, slender cylinders were located over the bogie on each side and drove the tall, plated drivers. One engine may have had stroke as long as 38"(965 mm), which would have required a still more delicate-looking tube. Finally, in addition to the tall dome, a grossly outsized inversely tapered stack reared out of the boiler in front. It was nearly equalled by the tall cab, which stood on the firebox.

Despite early demonstration of the design's inadequate adhesion, deliveries continued until 1853. A 6-car train (of small cars) was the engine's limit, but if the track was dry, the assembly would move at an impressive rate. Soon, however, the design was changed to a 4-4-0 layout with 72" drivers. The last of this class was retired in 1865.

Sources (Kinert, 1962; Brian Reed, Loco Profile 11, 1971, Reder (1974) differ on the number actually procured and over how long a period. Reed's Norris Locomotives study says 7 -- 28-32, 37, 38 -- but gives the dates of entry as April 1849, 2 in 1850, and the last 5 in 1951-1952.

Specifications by Steve Llanso of Sweat House Media
ClassJohn Stevens
Locobase ID4834
RailroadCamden & Amboy
CountryUSA
Whyte6-2-0
Number in Class8
Road Numbers28
GaugeStd
Number Built8
BuilderNorris
Year1849
Valve GearV-hook
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)46,000 / 20,865
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)96 / 2438
Boiler Pressure (psi / kPa)100 / 6.90
High Pressure Cylinders (dia x stroke) (in / mm)13" x 34" / 330x864
Tractive Effort (lbs / kg)5088 / 2307.88
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)15.20 / 1.41
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1520
Same as above plus superheater percentage1520
Same as above but substitute firebox area for grate area
Power L1
Power MT