Reading 4-6-0 "Ten-Wheeler" Type Locomotives

Data from France Commission des Annales des mines (Paris: Dunod, 1875), p. 256.

As part of a discussion of anthracite coal use, the authors describe this Ten-wheeler, which preceded the ultra-wide firebox Wootten camelbacks that would appear just a few years later. They note that one of these engines pulled 155 4-wheel coal cars, aggregating 416 tonnes (458 short tons), between Port Richmond and Palo Alto. Over a 153-km (95-mile) distance, coal consumption totalled 5,120 kg (5.64 short tons) of anthracite

Class L10 (Locobase 4101)

Interesting variation on the 3-cylinder locomotives that the Reading's Edward Elliott was experimenting with. The ten-wheeler layout obviously allowed more weight on the drivers while retaining the favored camelback layout.

Data from Paul T. Warner (RLHS Bulletin #58) shows heating surface area including a Taylor superheater. This area appears to be borne out by the RDG 11 - 1926 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

The 1926 diagram shows before and after configurations.

At the time of the diagram, both locomotives had been reconfigured with two 22" x 26" cylinders. 675 retained its saturated, 215-psi boiler while 676 had been superheated and had a boiler with 154 2" tubes and 26 5 1/4" flues totalling, with the firebox, 2,957 sq ft. . Alas, the diagram does not give the superheater area.

Class L5-a (Locobase 6725)

Data from CNJ 7 - 1944 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Drury (1993) notes that the 111 Camelbacks "were essentially the same locomotive" and served as mixed-traffic engines into the 1950s. This was among the first of the 20th Century batches. Shown in the specs is the result of a superheating upgrade that began in 1919 and that completely rebuilt the locomotives.

In 1936, the Reading sold 5 of the engines -- 592-596 -- to the Central RR of New Jersey, which operated them as 631-635.

Specifications
Class		L10	L5-a
Locobase ID	9119	4101	6725
Railroad	Reading	Reading	Reading
Whyte	4-6-0	4-6-0	4-6-0
Road Numbers		675-676	587-601
Gauge	Std	Std	Std
Builder	Reading	Reading	Burnham, Williams & Co
Year	1874	1911	1902
Valve Gear	Stephenson	Walschaert	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	0	14.50'	13.50'
Engine Wheelbase	0	28'	25.25'
Ratio of driving wheelbase to overall engine wheebase		0.52	0.53
Overall Wheelbase (engine & tender)	0		55.93'
Axle Loading (Maximum Weight per Axle)	0
Weight on Drivers	53352 lbs	172600 lbs	147550 lbs
Engine Weight	74957 lbs	226750 lbs	186650 lbs
Tender Light Weight	0		146350 lbs
Total Engine and Tender Weight	0	0	333000 lbs
Tender Water Capacity	0		7000 gals
Tender Fuel Capacity (oil/coal)	0		12 tons
Minimum weight per yard of rail on which locomotive could run	29.64 lb rail	95.89 lb rail	81.97 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	62"	74"	69"
Boiler Pressure	130 psi	215 psi	200 psi
Cylinders (dia x stroke)	18" x 24"	19" x 24" (3)	22" x 28"
Tractive Effort	13859 lbs	32095 lbs	33389 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	3.85	5.38	4.42
	Heating Ability
Firebox Area	86 sq. ft	260 sq. ft	211 sq. ft
Grate Area	28 sq. ft	90 sq. ft	85 sq. ft
Evaporative Heating Surface	1101	2957	1673
Superheating Surface	0		430
Combined Heating Surface	1101	2957	2103
Evaporative Heating Surface/Cylinder Volume	155.76	250.30	135.81
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	3640	19350	17000
Same as above plus superheater percentage	3640	19350	20475.99
Same as above but substitute firebox area for grate area	11180	55900	50828.63
Power L1	2909.56	9555.13	12318.58
Power MT	360.69	366.14	552.17