Data from table supplied by Allen Stanley in March 2004 and diagrams from M&O 7 -1925 Locomotive Diagrams supplied by Stanley in May 2005. See also "Rogers Ten Wheeler for Mobile & Ohio," Locomotive Engineering, Volume 13, No 2 (February 1899). Rogers actually delivered two versions that seem to have differed only in driver diameter. Out of the 90, only 20 had mixed-traffic driver dimensions.
Works numbers were 5247-5251 in March 1898 (road 136-140 and later 200-204),
5329-5338 in November 1898 (road 143-152, later 205-214), and 5474-5478 in November 1899 (road 178-182, later 215-219).
The handsome lines of this mixed-traffic Ten-wheeler were spoiled to some extent by a clerestory "mohawk" in the center of the cab roof.
Most of the class was withdrawn and scrapped in the late 1920s and early 1930s.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 136 |
| Locobase ID | 6285 |
| Railroad | Mobile & Ohio |
| Country | USA |
| Whyte | 4-6-0 |
| Number in Class | 20 |
| Road Numbers | 136-140, 143-52, 178-182 |
| Gauge | Std |
| Number Built | 20 |
| Builder | Rogers |
| Year | 1898 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 22.25 / 6.78 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.54 |
| Overall Wheelbase (engine & tender) (ft / m) | 48.58 / 14.81 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 103,200 / 46,811 |
| Engine Weight (lbs / kg) | 129,000 / 58,513 |
| Tender Loaded Weight (lbs / kg) | 93,000 / 42,184 |
| Total Engine and Tender Weight (lbs / kg) | 222,000 / 100,697 |
| Tender Water Capacity (gals / ML) | 4000 / 15.15 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 57 / 28.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 63 / 1600 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 26" / 457x660 |
| Tractive Effort (lbs / kg) | 20,458 / 9279.60 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.04 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 244 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13.10 / 3.99 |
| Firebox Area (sq ft / m2) | 156.75 / 14.59 |
| Grate Area (sq ft / m2) | 25 / 2.32 |
| Evaporative Heating Surface (sq ft / m2) | 1845 / 171.47 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1845 / 171.47 |
| Evaporative Heating Surface/Cylinder Volume | 240.86 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4500 |
| Same as above plus superheater percentage | 4500 |
| Same as above but substitute firebox area for grate area | 28,215 |
| Power L1 | 6486 |
| Power MT | 415.67 |