Data from "Detroit & Mackinac Consolidation Locomotives", Railway Gazette, Volume 36 No 4 (11 January 1904), p. 70. Works numbers were 29290-29291 in November 1903.
RG's report noted that the railroad's improvments in grades and "alinements" (a revised spelling of "alignment" adopted in the same spirit as the dropping of the "u" in "gauge") would allow 70-80 car trains and bought new equipment accordingly.
These engines were produced soon after the first three of a larger class ordered by the Virginia & Southwestern (Locobase 16405). So, either the D&M bought a pair that the V&S couldn't afford two more right away or the Michigan railroad thought they'd be sufficient.
Apparently, they were not quite the ticket for the D&M for they bought three more powerful 2-8-0s from Rogers (Locobase 12427) three years later. By then, this pair had been sold to the Virginia & Southwestern in 1905 as their 66-67. Taken into the Southern Railway, the pair took numbers 211-212 in 1916.
They served the Southern into the 1930s before being scrapped in November 1933 (212) and February 1936 (211).
Data from "New Locomotive Equipment-Detroit & Mackinac", Railway Age, Volume 41, No 10 (11 May 1906), p. 807. Works numbers were 40696-40698 in September 1906.
These remained in service on the D&M for over four decades before being scrapped in March 1947.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 29 | 33 |
| Locobase ID | 16404 | 12427 |
| Railroad | Detroit & Mackinac | Detroit & Mackinac |
| Country | USA | USA |
| Whyte | 2-8-0 | 2-8-0 |
| Number in Class | 3 | 3 |
| Road Numbers | 29-30 | 33-35/150-152 |
| Gauge | Std | Std |
| Number Built | 3 | 3 |
| Builder | Alco-Schenectady | Alco-Rogers |
| Year | 1903 | 1906 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 14.33 / 4.37 | |
| Engine Wheelbase (ft / m) | 22.25 / 6.78 | |
| Ratio of driving wheelbase to overall engine wheelbase | 0.64 | |
| Overall Wheelbase (engine & tender) (ft / m) | 52.15 / 15.90 | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 151,000 / 68,493 | 171,000 / 77,564 |
| Engine Weight (lbs / kg) | 168,000 / 76,204 | 192,600 / 87,362 |
| Tender Loaded Weight (lbs / kg) | 120,000 / 54,431 | |
| Total Engine and Tender Weight (lbs / kg) | 288,000 / 130,635 | |
| Tender Water Capacity (gals / ML) | 6000 / 22.73 | 4000 / 15.15 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 11 / 10 | 11 / 10 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 63 / 31.50 | 71 / 35.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 51 / 1295 | 57 / 1448 |
| Boiler Pressure (psi / kPa) | 200 / 1380 | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 26" / 533x660 | 23" x 28" / 584x711 |
| Tractive Effort (lbs / kg) | 38,220 / 17336.32 | 41,967 / 19035.93 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.95 | 4.07 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 376 - 2" / 51 | 398 - 2" / 51 |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 13 / 3.96 | 13.92 / 4.24 |
| Firebox Area (sq ft / m2) | 212.50 / 19.74 | 218 / 20.26 |
| Grate Area (sq ft / m2) | 34.25 / 3.18 | 35.87 / 3.33 |
| Evaporative Heating Surface (sq ft / m2) | 2773 / 257.62 | 3100 / 288.10 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 2773 / 257.62 | 3100 / 288.10 |
| Evaporative Heating Surface/Cylinder Volume | 266.12 | 230.31 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 6850 | 6815 |
| Same as above plus superheater percentage | 6850 | 6815 |
| Same as above but substitute firebox area for grate area | 42,500 | 41,420 |
| Power L1 | 6258 | 5619 |
| Power MT | 365.47 | 289.77 |