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|
|Driver Wheelbase (ft)||6.08||7||7|
|Engine Wheelbase (ft)||23.42||26.33||26.33|
|Ratio of driving wheelbase to overall engine wheebase||0.26||0.27||0.27|
|Overall Wheelbase (engine & tender) (ft)||54.08||53.89|
|Axle Loading (Maximum Weight per Axle) (lbs)||45,400||45,400|
|Weight on Drivers (lbs)||74,500||90,600||92,000|
|Engine Weight (lbs)||128,000||178,600||181,600|
|Tender Loaded Weight (lbs)||44,500||57,500||115,000|
|Total Engine and Tender Weight (lbs)||172,500||236,100||296,600|
|Tender Water Capacity (gals)||4000||5000||5000|
|Tender Fuel Capacity (oil/coal) (gals/tons)||7||12||12|
|Minimum weight of rail (calculated) (lb/yd)||62||76||77|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||70||79||79|
|Boiler Pressure (psi)||170||200||200|
|High Pressure Cylinders (dia x stroke) (in)||19" x 24"||19" x 28"||19" x 28"|
|Tractive Effort (lbs)||17,885||21,751||21,751|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.17||4.17||4.23|
|Firebox Area (sq ft)||145.62||176||176|
|Grate Area (sq ft)||25.80||41.75||41.75|
|Evaporative Heating Surface (sq ft)||1851||2895||2088|
|Superheating Surface (sq ft)||431|
|Combined Heating Surface (sq ft)||1851||2895||2519|
|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||24,755||35,200||41,184|