Data from Milwaukee Road 1930 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 1676-1678 in 1886.
Originally chartered in 1861 as the Chicago & Evanston, the first 10.8 miles to Calvary Cemetery opened on 1 May 1885. Consolidated with the Chicago & Lake Superior on 22 December 1885, the CE&LS reached Evanston on 1 June 1886. Presumably some of the very first trains on this line were pulled by these three Eight-wheelers.
Its independence was short-lived as the Chicago, Milwaukee & St. Paul Railway Company purchased the line in June 1887 and the trio underwent its first renumbering. Over the decades of renumberings, the locomotives finally received 718-720 in December 1927.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | H7 |
| Locobase ID | 9885 |
| Railroad | Chicago, Evanston & Lake Superior (Milwaukee Road) |
| Country | USA |
| Whyte | 4-4-0 |
| Number in Class | 3 |
| Road Numbers | 2-4/19, 84, 96/655-657/518-520/718-720 |
| Gauge | Std |
| Number Built | 3 |
| Builder | Rhode Island |
| Year | 1886 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.50 / 2.59 |
| Engine Wheelbase (ft / m) | 23.25 / 7.09 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.37 |
| Overall Wheelbase (engine & tender) (ft / m) | 45.54 / 13.88 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 60,000 / 27,216 |
| Engine Weight (lbs / kg) | 96,300 / 43,681 |
| Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 |
| Total Engine and Tender Weight (lbs / kg) | 156,300 / 70,897 |
| Tender Water Capacity (gals / ML) | 2700 / 10.23 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 50 / 25 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 62 / 1575 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 15,991 / 7253.40 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.75 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 221 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.92 / 3.63 |
| Firebox Area (sq ft / m2) | 127 / 11.80 |
| Grate Area (sq ft / m2) | 17.20 / 1.60 |
| Evaporative Heating Surface (sq ft / m2) | 1361 / 126.44 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1361 / 126.44 |
| Evaporative Heating Surface/Cylinder Volume | 192.50 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2580 |
| Same as above plus superheater percentage | 2580 |
| Same as above but substitute firebox area for grate area | 19,050 |
| Power L1 | 4376 |
| Power MT | 321.58 |