Data from "An Old Firm of Engine Builders", Railroad Gazette, Volume XXIX, No. 28 (9 July 1897), p. 488. See also "An East Indian Freight Locomotive," Locomotive Firemen's Magazine, Volume XXIII, no 2 (August 1897), p. 161, digesting from the Engineer of London. (Thanks to Abhijit Gore for his 2 January 2021 email noting the designation and road numbers.) Works numbers were 1489-1502 in 1896.
RG reports that the 166 was the 1,500th locomotive produced by the firm that began business as Charles Tayleur & Company, but was even then known as the Vulcan Foundry. The order was designed by the IM's George Barclay Bruce, CE.
A Mogul for India was quite appropriate, although in fact the wheel arrangement was not as common as in many other countries. Although apparently a 2-6-0, its front carrying axle rode in radial axle boxes rather than in a Bissel truck and the first and second driving axles were equalized. Also, like most British-built engines of the time, the 166 was driven by inside cylinders. The illustration of this class shows an odd shape to the smokebox that resembled a truncated cone in which the smokebox door end's diameter was noticeably smaller than the tubesheet end.
Four of the engines were delivered with a automatic rocking grate operated by a lever on the rear axle and taken in and out of gear by the fireman. (Locobase wonders if the apparatus withstood the operating environment's abuse.) An interesting economy concerned a substitute for the piping outlining panelling, lining and lettering. Instead of painting the lines, the builder riveted 1-2 in (25.4-50.8 mm) strips of polished zinc.
Gore's email pointed out that the IM merged with the Great Indian Peninsular Railway in 1904, but the only change was to add 1,000 to each road number.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | F3 |
| Locobase ID | 20021 |
| Railroad | Indian Midland |
| Country | India |
| Whyte | 2-6-0 |
| Number in Class | 14 |
| Road Numbers | 166-179/1166-1179 |
| Gauge | 5'6" |
| Number Built | 14 |
| Builder | Vulcan Foundry |
| Year | 1896 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | 22.08 / 6.73 |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 87,300 / 39,599 |
| Engine Weight (lbs / kg) | 107,520 / 48,770 |
| Tender Loaded Weight (lbs / kg) | 75,600 / 34,292 |
| Total Engine and Tender Weight (lbs / kg) | 183,120 / 83,062 |
| Tender Water Capacity (gals / ML) | 2400 / 9.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 8.80 / 8 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 49 / 24.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 54 / 1372 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18.5" x 26" / 470x660 |
| Tractive Effort (lbs / kg) | 25,212 / 11435.98 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.46 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 186 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.06 / 3.37 |
| Firebox Area (sq ft / m2) | 103 / 9.57 |
| Grate Area (sq ft / m2) | 21.25 / 1.97 |
| Evaporative Heating Surface (sq ft / m2) | 1180 / 109.63 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1180 / 109.63 |
| Evaporative Heating Surface/Cylinder Volume | 145.88 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3825 |
| Same as above plus superheater percentage | 3825 |
| Same as above but substitute firebox area for grate area | 18,540 |
| Power L1 | 3395 |
| Power MT | 257.21 |