New Haven 4-6-0 "Ten-Wheeler" Type Locomotives

Class 841 (Locobase 11443)

Data from "Locomotive Building," The Railroad Gazette, Vol XL, No 18 (10 February 1905), p 45. Works numbers were 25212, 25243, 25291-25292 in March 1905; 30831 , 30909, 30910-30912 in May.

Class G-4-a (Locobase 3317)

Data from NH 1962 Steam Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Works numbers were

1904

October 24755, 24758; November 24788, 24793-24794, 24802-24804, 24807-24809, 24814, 24820, 24824-24826, 24830-24832, 24837-24838; December 24854.

1905

January 24986-24991, 25009-25010, 25013-25014; February 25047-25048, 25068-25069, 25081-25082, 25112, 25132-25133, 25167, 25196; March 25212, 25243, 25291-25292.

Like the earlier 8-wheelers, many of these 10-wheelers were rebuilt in the 1920s with steel cabs, 12" piston valves, Baker, Southern, or Walschaert valve gear, new frames, and superheaters. Most ended their days in commuter service, to which they had been moved when the larger Pacifics entered service in the 'teens.

Two wound up on Australia's Commonwealth Railway as Class CA 78 & 79. 78 had Southern valve gear, 79 used Baker gear. 78's Australian career lasted 27 months, when she was written off. 79 lasted until May 1950, when she was written off. Both were scrapped in 1956. http://www.railpage.org.au/comrails/cr_locos/index.html

(Note: the official name for the New Haven was the New York, New Haven, and Hartford and the acronym that appeared on its tenders was NY, NH & H.)

Specifications
Class	841	G-4-a
Locobase ID	11443	3317
Railroad	New Haven	New Haven
Whyte	4-6-0	4-6-0
Road Numbers	841-849	800-849
Gauge	Std	Std
Builder	Burnham, Williams & Co	Burnham, Williams & Co
Year	1906	1904
Valve Gear	Baker	various
	Locomotive Length and Weight
Driver Wheelbase		13.50'
Engine Wheelbase		25.08'
Ratio of driving wheelbase to overall engine wheebase		0.54
Overall Wheelbase (engine & tender)		55.08'
Axle Loading (Maximum Weight per Axle)		45248 lbs
Weight on Drivers	110000 lbs	135860 lbs
Engine Weight	154000 lbs	174860 lbs
Tender Light Weight
Total Engine and Tender Weight	337400 lbs	0
Tender Water Capacity	6000 gals	5000 gals
Tender Fuel Capacity (oil/coal)		9 tons
Minimum weight per yard of rail on which locomotive could run	61 lb rail	75 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	72"	73"
Boiler Pressure	200 psi	190 psi
Cylinders (dia x stroke)	21" x 26"	22" x 26"
Tractive Effort	27073 lbs	27840 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.06	4.88
	Heating Ability
Firebox Area		197 sq. ft
Grate Area	34 sq. ft	29 sq. ft
Evaporative Heating Surface	2666	1929
Superheating Surface		400
Combined Heating Surface	2666	2329
Evaporative Heating Surface/Cylinder Volume	255.78	168.63
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	6800	5510
Same as above plus superheater percentage	6800	6447
Same as above but substitute firebox area for grate area	0	43793
Power L1	0	13164
Power MT	0	640.84