Data from C I & L 1 - 1940 locomotive diagram supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.
Just two Atlantics were ever delivered to the Monon. They were middle-of-the-pack engines that endured for more than three decades. They were superheated in the 1920s (Locobase 8314).
"Monon" is the common name for the Chicago, Indianopolis, and Louisville Railroad.
Data from C I & L 8 - 1941 locomotive diagram supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.
According to Drury (1993), the two Monon Atlantics (Locobase 7088) were retrofitted with Baker valve gear at the same time the piston valves were moved outside and the inboard-bearing trailing truck was replaced with a cast truck using outside bearings. But the C I & L's diagram shows Walschaert gear. Superheating the boiler and adding some direct heating surface area to the firebox (probably in the form of arch tubes) signficantly increased available power without sacrificing too much grip on the rail.
Even so, heavier passenger trains doomed this pair to retirement in 1936.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | I-1 | I-1-A |
| Locobase ID | 7088 | 8314 |
| Railroad | Chicago, Indianapolis & Louisville (Monon) | Chicago, Indianapolis & Louisville (Monon) |
| Country | USA | USA |
| Whyte | 4-4-2 | 4-4-2 |
| Number in Class | 2 | 2 |
| Road Numbers | 390-391 | 390-391 |
| Gauge | Std | Std |
| Number Built | 2 | |
| Builder | Brooks | Monon |
| Year | 1901 | 1921 |
| Valve Gear | Stephenson | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 7 / 2.13 | 7 / 2.13 |
| Engine Wheelbase (ft / m) | 28.71 / 8.75 | 28.25 / 8.61 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.24 | 0.25 |
| Overall Wheelbase (engine & tender) (ft / m) | 56.46 / 17.21 | 59.25 / 18.06 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 92,500 / 41,957 | 95,000 / 43,091 |
| Engine Weight (lbs / kg) | 167,300 / 75,886 | 177,100 / 80,331 |
| Tender Loaded Weight (lbs / kg) | 162,000 / 73,482 | 152,000 / 68,946 |
| Total Engine and Tender Weight (lbs / kg) | 329,300 / 149,368 | 329,100 / 149,277 |
| Tender Water Capacity (gals / ML) | 7400 / 28.03 | 7400 / 28.03 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 18 / 16 | 13 / 12 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 77 / 38.50 | 79 / 39.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 73 / 1854 | 73 / 1854 |
| Boiler Pressure (psi / kPa) | 200 / 1380 | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.5" x 26" / 521x660 | 20" x 26" / 508x660 |
| Tractive Effort (lbs / kg) | 25,445 / 11541.67 | 24,219 / 10985.57 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.64 | 3.92 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 322 - 2" / 51 | 168 - 2" / 51 |
| Flues (number - dia) (in / mm) | 28 - 5.375" / 137 | |
| Flue/Tube length (ft / m) | 15.65 / 4.77 | 15.15 / 4.62 |
| Firebox Area (sq ft / m2) | 163 / 15.15 | 190 / 17.66 |
| Grate Area (sq ft / m2) | 54.50 / 5.07 | 54.50 / 5.07 |
| Evaporative Heating Surface (sq ft / m2) | 2801 / 260.32 | 2063 / 191.73 |
| Superheating Surface (sq ft / m2) | 490 / 45.54 | |
| Combined Heating Surface (sq ft / m2) | 2801 / 260.32 | 2553 / 237.27 |
| Evaporative Heating Surface/Cylinder Volume | 282.07 | 218.31 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 10,900 | 10,900 |
| Same as above plus superheater percentage | 10,900 | 12,971 |
| Same as above but substitute firebox area for grate area | 32,600 | 45,220 |
| Power L1 | 8861 | 19,114 |
| Power MT | 422.38 | 887.14 |