See Trains Magazine (August 1979) for an account of how these engines ran. They were well-liked with many engineers feeling that they were capable of higher speeds than the road would let them reach.
See Locobase 10077 for the later batch of R-2s, which had slightly different specs.
These R-2s (works numbers 62054-62058) had slightly fewer tubes than the earlier R-1, a cleaner-looking Walschaerts valve motion, single crosshead guides, and Elesco feedwater heaters replaced by Worthingtons, but otherwise varied little from the earlier R-1s.
These engines later (1947) went on to the B&O as KB-1 and KB-1a 7700-7709, where the slip joints in the piping to the front engine unit (which leaked frequently) were replaced by ball joints. They were slippery on grades and not as well liked as the Big Sixes (2-10-2), although a later relocation of the air pumps to the pilot on one engine reduced the slipping.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Seaboard Air Line (SAL)||Seaboard Air Line (SAL)|
|Number in Class||5||5|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.18||0.18|
|Overall Wheelbase (engine & tender)||97.75'||97.75'|
|Axle Loading (Maximum Weight per Axle)||55000 lbs||55000 lbs|
|Weight on Drivers||330000 lbs||330000 lbs|
|Engine Weight||480000 lbs||480000 lbs|
|Tender Light Weight||310200 lbs||310200 lbs|
|Total Engine and Tender Weight||790200 lbs||790200 lbs|
|Tender Water Capacity||16000 gals||16000 gals|
|Tender Fuel Capacity (oil/coal)||24 tons||24 tons|
|Minimum weight of rail (calculated)||92 lb/yard||92 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||230 psi||230 psi|
|Cylinders (dia x stroke)||22" x 30"||22" x 30"|
|Tractive Effort||82280 lbs||82280 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.01||4.01|
|Firebox Area||516 sq. ft||515 sq. ft|
|Grate Area||96.30 sq. ft||96.30 sq. ft|
|Evaporative Heating Surface||5513 sq. ft||5429 sq. ft|
|Superheating Surface||2397 sq. ft||2397 sq. ft|
|Combined Heating Surface||7910 sq. ft||7826 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||208.84||205.66|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||22149||22149|
|Same as above plus superheater percentage||28794||29015|
|Same as above but substitute firebox area for grate area||154284||155170|