Within a couple of months of each other, the AERJ described engines supplied to the Concord & Montreal. This is the Atlantic that the AERJ notes offers all the qualities of the design -- firebox behind the drivers, a guiding truck -- except for high drivers.
This engine was absorbed by the Boston & Maine as its lone Class J. In Harry A Frye, Minuteman steam: Boston & Maine steam locomotives, 1911-1958 (Littleton, MA : Boston and Maine Railroad Historical Society, 1982), Harry Frye said the B&M call these Atlantics "Trailers", for the trailing truck. It was scrapped in October 1927.
Class J-1 3204-3209 arrived in 1902, 3210-3219 -- J-1a -- arrived in 1907, and 3220-3239 -- J-1b -- were delivered in 1908-1909.
All had 11" (279 mm) piston valves and 23 sq ft (2.14 sq m) of arch tubes, which contributed to the firebox heating surface area. Weight on drivers and overall engine weight increased with each batch.
Subclass Builder Year 1911 Road # Adhesion weight Engine weight.
J-1 Schenectady 1902 3204-3209 81,000 lb 159,600
J-1a Schenectady 1907 3210-3219 88,200 lb 170,000
J-1b Manchester 1908-1909 3220-3244 90,000 lb 175,000
The 25 Manchester engines were delivered with Walschaert outside radial valve gear.
Three--3240, 3242, 3244--were assigned to the Sullivan County Railroad and numbered 9, 11, and 10, respectively. Three more--3231, 3241, 3243--to the Vermont Valley and numbered 21, 29, and 30. 3242-3243 were placed back on the B&M roster in 1911. The other four engines regained their B&M numbers in 1926..
Thirty-one were superheated in the 1920s; see Locobase 16160.
Alco's Schenectady and Manchester work supplied 41Atlantics to the B&M in 1902-1909; see Locobase 2381. The B&M superheated most of its locomotives and most of the J-1 class was modified. By 1927, 25 of the 41 from all four subclasses of J-1s had been superheated. 32505 and 3209 from the 1902 Schenectady batch had been redesignated J-1f and J-1c, respectively. Four of the 1907 J-1a--3214, 3216, 3218-3219--were now J-1d.
Of the Manchester class, 3221-3230, 3232, 3234-3244 were converted to J-1e by 1928.
The resulting superheat ratio was adequate, but not ambitious and the overhaul added less than a ton to the engine weight. Stephenson link locomotives (the 15 Schenectadies) kept that valve gear and the 25 Manchesters retained the Walschaert gear. All kept their 11" (279 mm) piston valves and 23 sq ft (2.14 sq m) of arch tubes. Most of the superheated engines received new fireboxes as well.
By 1939, all of the earlier locomotives had been retired and the number of J-1es had been reduced to 20.
|Specifications by Steve Llanso of Sweat House Media|
|Class||33/J||J-1, J-1a, J-1b||J-1c, d, e, f|
|Railroad||Concord & Montreal (B&M)||Boston & Maine (B&M)||Boston & Maine (B&M)|
|Number in Class||1||41||41|
|Road Numbers||33 / 733 / 3200||3204-3244||3204-3244|
|Builder||Burnham, Williams & Co||Alco||B&M|
|Valve Gear||Stephenson||Stephenson or Walsch||Stephenson or Walsch|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.26||0.27||0.27|
|Overall Wheelbase (engine & tender)||54.08'||53.89'|
|Axle Loading (Maximum Weight per Axle)||45400 lbs||45400 lbs|
|Weight on Drivers||74500 lbs||90600 lbs||92000 lbs|
|Engine Weight||128000 lbs||178600 lbs||181600 lbs|
|Tender Light Weight||44500 lbs||57500 lbs||115000 lbs|
|Total Engine and Tender Weight||172500 lbs||236100 lbs||296600 lbs|
|Tender Water Capacity||4000 gals||5000 gals||5000 gals|
|Tender Fuel Capacity (oil/coal)||7 tons||12 tons||12 tons|
|Minimum weight of rail (calculated)||62 lb/yard||76 lb/yard||77 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||170 psi||200 psi||200 psi|
|Cylinders (dia x stroke)||19" x 24"||19" x 28"||19" x 28"|
|Tractive Effort||17885 lbs||21751 lbs||21751 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.17||4.17||4.23|
|Firebox Area||145.62 sq. ft||176 sq. ft||176 sq. ft|
|Grate Area||25.80 sq. ft||41.75 sq. ft||41.75 sq. ft|
|Evaporative Heating Surface||1851 sq. ft||2895 sq. ft||2088 sq. ft|
|Superheating Surface||431 sq. ft|
|Combined Heating Surface||1851 sq. ft||2895 sq. ft||2519 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||235.02||315.07||227.24|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||4386||8350||8350|
|Same as above plus superheater percentage||4386||8350||9770|
|Same as above but substitute firebox area for grate area||24755||35200||41184|