Monticello Railway Museum 2-8-0 "Consolidation" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class H-4 - restored (Locobase 16341)

Data from diagram 21-F-3 drafted by the Monticello Railway Museum and supplied in a 20 January 2018 email from Chris Hohl, to whom thanks are due both for securing the diagram and for telling Locobase about the update. See also "L-27 Members Build Boiler for 1907 Steam Locomotive", Boilermaker Reporter, Volume 44, No. 4 (September-October 2005), p. 8, archived at https://boilermakers.org/sites/default/files/reporter/V44N4_0.pdf, last accessed 28 January 2018.

As noted in the original H-4 entry (Locobase 5143), the 401 originally entered service on the Southern Railway in 1907. After its retirement, second career in Alabama, and eventual purpose by the Monticello & Sangamon Valley Railway Historical Society, the Monticello Museum Railway received a donation in 1995 to begin restoring the locomotive.

This proved to be a fifteen-year undertaking. One key decision in the rebuild was to convert the locomotive to oil burning, which meant changes both in the firebox and in the tender. Included in the firebox heating surface area is 27.2 sq ft (2.53 sq m) identified in the diagram as "flue sheets".

401's new boiler was constructed by members of Local 27 (St Louis) working for Continental Fabricators Inc (CFI). Because they lacked detailed drawings or templates or the equipment to shape the plates, said the Reporter, they had to use "their experience and 'boilermaker eye'." When finished, the vessel measured 29 ft 8 in (9.04 m) long, 5 ft 10 in (1.78 m) wide, and 9 ft 5 in (2.87 m) high and weighed 39,000 lb (17,690 kg)

Locobase wondered about the tube count in the diagram, which is shown to be 257. His calculation for the reported tube heating surface area of 1,720.8 sq ft (159.87 sq m), given the tube length and diameter, is that the new boiler should have 225 tubes. But a very clear photo of the front tube sheet in the 2005 Boilermaker Reporter article reveals the 257 holes. So Locobase has recalculated the tube heating surface area to be 1,966 sq ft, and a total as the 2.091 sq ft shown in the specs. This is still 14 tubes fewer than the 271 in the original boiler.

401's first public run occurred on 18 September 2010. MRM reports that its fuel consumption averages 38 US gallons (144 litres) /hour and its water use comes to 800 gallons (3,038 litres)/hour

Principal Dimensions by Steve Llanso of Sweat House Media
ClassH-4 - restored
Locobase ID16,341
RailroadMonticello Railway Museum
CountryUSA
Whyte2-8-0
Number in Class1
Road Numbers401
GaugeStd
Number Built
BuilderMRM
Year2010
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)16 / 4.88
Engine Wheelbase (ft / m)24.29 / 7.40
Ratio of driving wheelbase to overall engine wheebase 0.66
Overall Wheelbase (engine & tender) (ft / m)54.90 / 16.73
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)146,400 / 66,406
Engine Weight (lbs / kg)164,800 / 74,752
Tender Loaded Weight (lbs / kg)105,900 / 48,035
Total Engine and Tender Weight (lbs / kg)270,700 / 122,787
Tender Water Capacity (gals / ML)7200 / 27.27
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1100 / 4.20
Minimum weight of rail (calculated) (lb/yd / kg/m)61 / 30.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)21" x 28" / 533x711
Tractive Effort (lbs / kg)36,827 / 16704.47
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.98
Heating Ability
Firebox Area (sq ft / m2)124.80 / 11.59
Grate Area (sq ft / m2)28.70 / 2.67
Evaporative Heating Surface (sq ft / m2)2091 / 194.26
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2091 / 194.26
Evaporative Heating Surface/Cylinder Volume186.29
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5740
Same as above plus superheater percentage5740
Same as above but substitute firebox area for grate area24,960
Power L14596
Power MT276.84