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 |
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