The builders' data comes from a table compiled by B. Rumary based on information from Jeremy Lambert and supplied by Allen Stanley in March 2004. Rumary-Lambert assign works #1543-1550, manufactured in July-August 1892..
According to the web site: "Engine 494, an American type 4-4-0 locomotive, steamed out of the builder's yard at the Manchester Locomotive Works in Manchester, New Hampshire in July 1892. The 494 was originally built for the Eastern Railroad but was later acquired by the Boston & Maine Railroad. In 1911 No. 494 was renumbered as the 905. This historic engine had served the Eastern Railroad and the B&M, hauling passenger cars and light freight. Toward the end, the 494 was used to haul coal from Fabyan Station, at steep grade, to Marshfield Station at the 2700 foot level of Mount Washington, New Hampshire. This coal was used by the Mount Washington Cog Railway for its climb to the 6,288 foot summit. Engine No. 494 was finally retired in 1938." She appeared at the 1939 World's Fair and was later displayed at the town of Hartfort, Vermont.
Built between 1900-1911. Many were used on suburban service out of Boston's North Station.
| Specifications | ||
|---|---|---|
| Class | A | A-41 |
| Locobase ID | 3316 | 2380 |
| Railroad | Boston & Maine | Boston & Maine |
| Whyte | 4-4-0 | 4-4-0 |
| Road Numbers | 491-498 / 902-909 | 950-1029 |
| Gauge | Std | Std |
| Builder | Manchester | Manchester |
| Year | 1892 | 1909 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 9' | 9' |
| Engine Wheelbase | 23.59' | 23.58' |
| Ratio of driving wheelbase to overall engine wheebase | 0.38 | 0.38 |
| Overall Wheelbase (engine & tender) | 46.17' | |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 79000 lbs | 74000 lbs |
| Engine Weight | 104000 lbs | 115000 lbs |
| Tender Light Weight | 90000 lbs | |
| Total Engine and Tender Weight | 0 | 205000 lbs |
| Tender Water Capacity | 3100 gals | 4000 gals |
| Tender Fuel Capacity (oil/coal) | 6 tons | 7 tons |
| Minimum weight per yard of rail on which locomotive could run | 66 lb rail | 62 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 66" | 69" |
| Boiler Pressure | 150 psi | 190 psi |
| Cylinders (dia x stroke) | 18" x 24" | 18" x 24" |
| Tractive Effort | 15022 lbs | 18200 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.26 | 4.07 |
| Heating Ability | ||
| Firebox Area | ||
| Grate Area | 18.50 sq. ft | 26 sq. ft |
| Evaporative Heating Surface | 1630 | 1751 |
| Superheating Surface | ||
| Combined Heating Surface | 1630 | 1751 |
| Evaporative Heating Surface/Cylinder Volume | 230.60 | 247.72 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2775 | 4940 |
| Same as above plus superheater percentage | 2775 | 4940 |
| Same as above but substitute firebox area for grate area | 0 | 0 |
| Power L1 | 0 | 0 |
| Power MT | 0 | 0 |
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