Five large, high-boilered suburban passenger engines with fixed tender supported by three-axle trailing truck for running in both directions. Drury (1993) describes them as "big-boilered ...engines that looked like condensed, telescoped versions of parent NYC's Hudsons." The evidence also shows that they were derived from the earlier 2-6-6T D1s that were rebuilt by Lima in the late 1920s.
Chris Hohl points out that the engines later received thicker tires, which increased driver diameters to 64".
Alvin Staufer (Steam Power of the New York Central System, 1961) reported that they were "amazingly powerful and tireless for their size, capable of handling up to 20 steel coaches."
Noel Weaver, of Fort Lauderdale, Florida responded to a thread begun on http://railroad.net/forums/viewtopic.php?t=9105&sid=4833bc78e45a6d462ff52eb6d99e14b5 (accessed 26 Sept 2005) with a post dated Wed Dec 22, 2004 2:57 am. In answer to the question that began the thread, Weaver said that this class "...operated mostly between Boston and Riverside via the Highland Branch and the main line. They probably also ran to Framingham on a more or less regular basis too. These were the RS-3's and GP-7's [all-purpose first-generation diesels] of the steam era as they could and did run quite well in reverse.
"They ran right up until the time that the diesels arrived maybe in the late 1940's or very early 1950's.
"I don't think they were regularly used anywhere else on the system after they were replaced by diesels in Boston."
eddiebear added on Wed Dec 22, 2004 7:57 am: "I think they might have gone to Milford too.
In one the TRAINS Album of New England Railroads, circa mid-1940s, there's a photo of one of them at speed on the Weston Park curve by the golf course west of Riverside."
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Boston & Albany (NYC)|
|Number in Class||5|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||15 / 4.57|
|Engine Wheelbase (ft / m)||42.66 / 13|
|Ratio of driving wheelbase to overall engine wheebase||0.35|
|Overall Wheelbase (engine & tender) (ft / m)||42.66 / 13|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||180,000 / 81,647|
|Engine Weight (lbs / kg)||352,000 / 159,665|
|Tender Loaded Weight (lbs / kg)|
|Total Engine and Tender Weight (lbs / kg)||352,000|
|Tender Water Capacity (gals / ML)||5000 / 18.94|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||6 / 5.50|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||100 / 50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||63 / 1600|
|Boiler Pressure (psi / kPa)||214.70 / 14.80|
|High Pressure Cylinders (dia x stroke) (in / mm)||23.5" x 26" / 597x660|
|Tractive Effort (lbs / kg)||41,593 / 18866.29|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.33|
|Firebox Area (sq ft / m2)||213 / 19.79|
|Grate Area (sq ft / m2)||60.80 / 5.65|
|Evaporative Heating Surface (sq ft / m2)||2761 / 256.60|
|Superheating Surface (sq ft / m2)||788 / 73.23|
|Combined Heating Surface (sq ft / m2)||3549 / 329.83|
|Evaporative Heating Surface/Cylinder Volume||211.53|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||13,054|
|Same as above plus superheater percentage||15,926|
|Same as above but substitute firebox area for grate area||55,792|