This was the earlier prototype Mallet pusher that inspired the Pennsy to buy the ten larger and more powerful CC2s locomotives described in Locobase 1425. Like all Pennsy engines of the time, the CC1s had a Belpaire firebox fed by a Crawford mechanical stoker. The specs show that the firebox heating surface included 32 sq ft (3 sq m) of arch tubes, but the number of tubes seems to have been cut in half once the engine entered service. All four cylinders were served by 14" (356 mm) piston valves.
CC1s served the Lines West (of Pittsburgh) portion of the system as a drag-freighter and pusher.
These were enormous compound articulateds that were significantly more powerful than the single CC1s experimental engine procured in 1912 (Locobase 12008). Intended for pusher and hump yard service, the CC2s class was designed to work on grades up to 5% and on curves with radii up to 18 deg. So small were the drivers that the leading LP cylinders showed a perceptible rake (1 in 35) to ensure that they'd clear the rail as the front engine traversed in curves. All 4 cylinders were supplied by 14" (356 mm) piston valves. Firebox heating surface area included 76 sq ft (7.05 sq m) in the combustion chamber and 42 sq ft (3.9 sq m) in the arch tubes.
Although deprived of the Belpaire firebox usually found on the Pennsy, the giant switchers nevertheless proved quite satisfactory and remained in service until the late 1940s. The first was sold for scrap in October 1947, the last in April 1949.
One of three engines assessed at the end of the 19th century. This was the London & NorthWestern's Webb Compound. The other two were the 1504, a Schenectady-built simple-expansion, and 1510, a Baldwin compound.
Webb strongly believed in his method of compounding and hoped to interest American railroads in its merits. He contracted with Beyer, Peacock to build a single engine. Very little changed on the engine, excepting the addition of a "cow-catcher" with center coupler and Westinghouse air brake pumps near the rudimentary shelter over the footplate. The copper firebox was fitted with a brick arch.
The experiment was doomed from the start, mostly because of pre-existing and fundamental differences in priorities in engine design between British and American locomotive builders.
American drivers quickly loathed the scanty cab and the Pennsylvania rebuilt the engine with a full housing. But nothing could overcome the 1320's low power and, although the Railway Magazine article ddn't mention it, the use of a single carrying axle forward on a passenger locomotive.
The editor noted the summary judgment passed by T N Ely, then chief of motive power for the Pennsy. The 1320 was well-built and did indeed prove economical, he said.
"[B]ut these proofs of the thoroughness of British workmanship and material did not pervent the engine from reaching the 'scrap heap' at the early date common to American locomotive productions," wrote Railway Magazine's editor. That's a typically severe verdict from a British judge, as the time in service amounted to less than eight years when the 1320 was scrapped in 1897. (Most American locomotives operated for several times as long if the design suited conditions.)
Moreover, the Pennsy's Mr Bishop commented on compounds in the 1895 report from Engineering News. His appraisal of the Webb compound was ungenerous. It was difficult to start because of its divided drive (a problem encountered in British service as well). "The valve motion on that engine, as the men were not able to hear the exhaust, was in very bad shape. Indicator cards showed excessive back pressure in the high-pressure cylinders, and that the valves were not square, so that perhaps would account for not being able to get a speed of much more than 60 miles per hour. The engine was very rough riding, having a very jerky motion."
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||Pennsylvania (PRR)||Pennsylvania (PRR)||Pennsylvania (PRR)|
|Number in Class||1||10||1|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||15 / 4.57||14.75 / 4.50||9.67 / 2.95|
|Engine Wheelbase (ft / m)||39.50 / 12.04||40.12 / 12.23||18.09 / 5.51|
|Ratio of driving wheelbase to overall engine wheebase||0.38||0.37||0.53|
|Overall Wheelbase (engine & tender) (ft / m)||71.83 / 21.89||78.71 / 23.99||37.83 / 11.53|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)||54,800 / 24,857||34,550 / 15,672|
|Weight on Drivers (lbs / kg)||408,700 / 185,383||458,140 / 207,809||66,700 / 30,255|
|Engine Weight (lbs / kg)||408,700 / 185,383||458,140 / 207,809||99,350 / 45,064|
|Tender Loaded Weight (lbs / kg)||186,400 / 84,550||191,860 / 87,026||57,850 / 26,240|
|Total Engine and Tender Weight (lbs / kg)||595,100 / 269,933||650,000 / 294,835||157,200 / 71,304|
|Tender Water Capacity (gals / ML)||9000 / 34.09||10,000 / 37.88||2221 / 8.41|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||17.50 / 11.80||20 / 18.20||4.50 / 4.10|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||85 / 42.50||95 / 47.50||56 / 28|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||56 / 1422||51 / 1295||75 / 1905|
|Boiler Pressure (psi / kPa)||205 / 14.10||225 / 15.50||175 / 12.10|
|High Pressure Cylinders (dia x stroke) (in / mm)||25" x 30" / 635x762||26" x 28" / 660x711||14" x 20" / 356x508|
|Low Pressure Cylinders (dia x stroke) (in / mm)||39" x 30" / 991x762||40" x 28" / 1016x711||24" x 20" / 610x508 (1)|
|Tractive Effort (lbs / kg)||82,702 / 37513.04||99,796 / 45266.76||8701 / 3946.71|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.94||4.59||7.67|
|Firebox Area (sq ft / m2)||237 / 22.03||391 / 36.34||193|
|Grate Area (sq ft / m2)||78 / 7.25||96.30 / 8.95||20.50 / 1.90|
|Evaporative Heating Surface (sq ft / m2)||4921 / 457.34||5030 / 467.47||1457 / 135.36|
|Superheating Surface (sq ft / m2)||988 / 91.82||1406 / 130.67|
|Combined Heating Surface (sq ft / m2)||5909 / 549.16||6436 / 598.14||1457 / 135.36|
|Evaporative Heating Surface/Cylinder Volume||288.72||292.34||408.88|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||15,990||21,668||3588|
|Same as above plus superheater percentage||18,708||26,434||3588|
|Same as above but substitute firebox area for grate area||56,844||107,330||33,775|