Baldwin works numbers were:
January 42832; February 42854-42855; March 43047-43049, 43071-43073; April 43140, 43148-43150, 43275; May 43289
July 45989; August 46112, 46164; September 46267, 46406; October 46677, 46713; December 47282, 47391, 47489
January 47650; February 47746, 47852, 47950; March 48026, 48067, 48130, 48194; April
48277-48279; May 48577, 48682; June 48901, 48902, 48940, 49086-49087; July 49308, 49400; August 49545
September 52371, 52425; November 52464-52468, 52518-52520, 52552-2555, 52598-52605; December 52642-52645
Baldwin reported that these huge locomotives were intended for the 2.4% grades in the Cumberland Division, over which they would haul long, loaded trains of coal cars.
The cylinders used a combination of 14" (356 mm) piston valves for the HP cylinders actuated by Baker gear and Allen balanced slide valves for the LP cylinders operated by Walschaert's gear. When the LP cylinders were rebuilt with piston valves, they were opened by Baker gear. (Thanks to Chris Hohl for providing an example of the weird-looking result.)
Four arch tubes contributed 35 sq ft (3.25 sq m) to the firebox heating surface area.
Definitely intended for main-line service, these big articulateds were able to negotiate curves as sharp as 22 deg. Total weight distribution varied by only 1,100 lb between the front and rear engine units.
Several classes beginning with 15 EL-1 (1916) and followed by 15 EL-2 (7200-7214 in 1916), 30 EL-3 (7115-7144 in 1917) and 26 EL-5 (7145-7170 in 1919-1920) -- all by Baldwin.
All surviving locomotives were converted from 1927 on after the prototype demonstrated a considerable improvement in pulling power; see Locobase 305.
The last of these left service in 1954.
These were B&O rebuilds of B&O compound Mallets (Locobase 439) to four-cylinder simple-expansion machines beginning in 1927. 64 engines were converted altogether, all to the same powerful standard.
Compared to the EL-6a conversion (Locobase 3556), these locomotives didn't work quite so hard, but steamed as easily. All four cylinders used 14" (356 mm) piston valves.
Smaller drivers undoubtedly confined them to hill work, where they served until the early 1950s.
These were simpled conversions of SAL 2-8-8-2s (Locobase 15148) that had come onto the B&O in 1922. They had a relatively high driver diameter and a hard-worked, but relatively free-steaming boiler. The last of these left service in 1954.
|Specifications by Steve Llanso|
|Railroad||Baltimore & Ohio (B&O)||Baltimore & Ohio (B&O)||Baltimore & Ohio (B&O)|
|Builder||Baldwin||B & O||B & O|
|Valve Gear||Baker or Walschaert||Baker or Walschaert||Southern|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.31||0.31||0.29|
|Overall Wheelbase (engine & tender)||82.61'||82.61'||98.27'|
|Axle Loading (Maximum Weight per Axle)||58000 lbs||61300 lbs|
|Weight on Drivers||462500 lbs||459400 lbs||456700 lbs|
|Engine Weight||485600 lbs||484400 lbs||492000 lbs|
|Tender Light Weight||206400 lbs||262000 lbs||219000 lbs|
|Total Engine and Tender Weight||692000 lbs||746400 lbs||711000 lbs|
|Tender Water Capacity||12000 gals||18000 gals||12000 gals|
|Tender Fuel Capacity (oil/coal)||20 tons||18 tons||20 tons|
|Minimum weight of rail (calculated) on which locomotive could run||96 lb/yard||96 lb/yard||95 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||210 psi||210 psi||225 psi|
|High Pressure Cylinders (dia x stroke)||26" x 31" (2)||24" x 32" (4)||25" x 32" (4)|
|Low Pressure Cylinders (dia x stroke)||41" x 31" (2)|
|Tractive Effort||91993 lbs||113452 lbs||121429 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||5.03||4.05||3.76|
|Firebox Area||393 sq. ft||341 sq. ft||398 sq. ft|
|Grate Area||88.17 sq. ft||88.17 sq. ft||88 sq. ft|
|Evaporative Heating Surface||5836 sq. ft||5784 sq. ft||5922 sq. ft|
|Superheating Surface||1415 sq. ft||1415 sq. ft||1380 sq. ft|
|Combined Heating Surface||7251 sq. ft||7199 sq. ft||7302 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||306.36||172.60||162.87|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||18516||18516||19800|
|Same as above plus superheater percentage||22219||22219||23562|
|Same as above but substitute firebox area for grate area||99036||85932||106565|