Chicago Great Western 4-6-0 "Ten-Wheeler" Type Locomotives

Class E1 (Locobase 4162)

See http://www.geocities.com/zvwrr/chicago_great_western_steam.html for the original 1917 railroad diagrams. Firebox heating surface includes 24 sq ft of arch tubes. According to Drury (1993), these were later sold to the Canadian government

Class E4 (Locobase 4163)

See http://www.geocities.com/zvwrr/chicago_great_western_steam.html for the original 1917 railroad diagrams. Firebox heating surface includes 28.75 sq ft of arch tubes. Some dimensions difficult to determine from plans.

Class E6s (Locobase 4164)

See http://www.geocities.com/zvwrr/chicago_great_western_steam.html for the original 1917 railroad diagrams. Firebox heating surface includes 24 sq ft of arch tubes. E6s 500-501 similar but had more weight on the drivers (151,200 lb).

Class E7s (Locobase 4156)

Class E7s (Locobase 4165)

See http://www.geocities.com/zvwrr/chicago_great_western_steam.html for the original 1917 railroad diagrams. Firebox heating surface includes 27 sq ft of arch tubes. This was a slightly larger version of the E6s; 506-509 had a slightly lower weight on the drivers (151,750 lb).. Both classes had an impressive amount of superheating flue surface. But note the high boiler demand factor.

Both of the E7 subtypes were refitted again in the 1920s. After those modifications, tube count went to 202, arch tube area dropped to 22 sq ft, and total evaporative heating surface area to 2,457 sq ft. Weight on the drivers climbed to 162,000 lb and total engine weight rose to 216,200 lb.

Specifications
Class	E1	E4	E6s	E7s	E7s
Locobase ID	4162	4163	4164	4156	4165
Railroad	Chicago Great Western	Chicago Great Western	Chicago Great Western	Chicago Great Western	Chicago Great Western
Whyte	4-6-0	4-6-0	4-6-0	4-6-0	4-6-0
Road Numbers	200-203	170-175	502-503	504-505	506-509
Gauge	Std	Std	Std	Std	Std
Builder	Burnham, Williams & Co	Richmond	Baldwin	Baldwin	Baldwin
Year	1899	1901	1909	1910	1910
Valve Gear	Stephenson	Stephenson	Walschaert	Walschaert	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	15'	14'	15.25'	16'	16'
Engine Wheelbase	27.17'	24.25'	27.09'	27.83'	27.83'
Ratio of driving wheelbase to overall engine wheebase	0.55	0.58	0.56	0.57	0.57
Overall Wheelbase (engine & tender)	55.37'	52.87'	57.28'	58.56'	58.57'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	122800 lbs	103175 lbs	144950 lbs	162000 lbs	151750 lbs
Engine Weight	167550 lbs	133475 lbs	198000 lbs	216200 lbs	208050 lbs
Tender Light Weight	110080 lbs	118080 lbs	149000 lbs	149000 lbs	149000 lbs
Total Engine and Tender Weight	277630 lbs	251555 lbs	347000 lbs	365200 lbs	357050 lbs
Tender Water Capacity	6145 gals	6145 gals	8000 gals	8000 gals	8000 gals
Tender Fuel Capacity (oil/coal)	5 tons	9 tons	13 tons	13 tons	13 tons
Minimum weight per yard of rail on which locomotive could run	68.22 lb rail	57.32 lb rail	80.53 lb rail	90 lb rail	84.31 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	68"	70"	73"	73"	73"
Boiler Pressure	200 psi	180 psi	180 psi	180 psi	180 psi
Cylinders (dia x stroke)	20" x 28"	18" x 26"	24" x 28"	24" x 28"	24" x 28"
Tractive Effort	28000 lbs	18412 lbs	33803 lbs	33803 lbs	33803 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.39	5.60	4.29	4.79	4.49
	Heating Ability
Firebox Area	214 sq. ft	183.40 sq. ft	169.50 sq. ft	191 sq. ft	194 sq. ft
Grate Area	32.60 sq. ft	29.10 sq. ft	42.60 sq. ft	46.70 sq. ft	46.70 sq. ft
Evaporative Heating Surface	2463	2031	2408	2382	2382
Superheating Surface			480	480	480
Combined Heating Surface	2463	2031	2888	2862	2862
Evaporative Heating Surface/Cylinder Volume	241.92	265.23	164.25	162.47	162.47
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	6520	5238	7668	8406	8406
Same as above plus superheater percentage	6520	5238	8942.46	9815.81	9815.81
Same as above but substitute firebox area for grate area	42800	33012	35580.91	40146.04	40776.60
Power L1	7865.70	8084.48	11316.15	11437.90	11460.30
Power MT	423.64	518.24	516.34	466.97	499.48