East Broad Top No. 12
United States 1911 1 produced
The East Broad Top operated six Mikados, all of which survive to this day. The oldest of these is No. 12, which was christened “Millie”. Like her newer sisters, she had 48-inch diameter drivers, but was lighter and had smaller cylinders. When the EBT was reopened in 1960 as a complete heritage railway with all its equipment, number 12 remained in service with three of her sisters until she had to be retired in 2000 due to wear and tear. After the railroad had reopened in 2020 under new ownership, the locomotive remains inoperable and it remains to be seen if she will be refurbished.
Technical data
General
- Built
- 1911
- Manufacturers
- Baldwin
- Wheel arrangement
- 2-8-2 (Mikado)
- Gauge
- 914 mm (Three feet)
Dimensions and weights
- Wheelbase
- 7.98 m
- Total wheelbase
- 14.90 m
- Service mass
- 50.8 t
- Adhesion mass
- 39.9 t
- Total mass
- 78 t
- Rigid wheelbase
- 3.96 m
- Axle load
- 10 t
- Water capacity
- 11,356 l
- Fuel capacity
- 5.4 t (coal)
Boiler
- Grate area
- 2.991 m²
- Firebox surface
- 10.219 m²
- Tube heating surface
- 146.415 m²
- Evaporative heating surface
- 156.635 m²
- Total heating surface
- 156.6 m²
Power plant
- Driver diameter
- 1,219 mm
- Boiler pressure
- 12.4 bar
- Expansion type
- simple expansion
- Cylinders
- two, 432 x 610 mm
Power
- Power source
- steam
- Estimated power
- 597 kW (812 PS)
- Starting effort
- 98.3 kN
Calculated values
- Factor of adhesion
- 1 : 3.98
- Optimal speed
- 37 km/h
- Power-to-weight ratio
- 11.8 kW/t
- Heating Surface Equivalent
- 207.7 m²
- Cylinder volume/HSE
- 1 : 859.47
- Adhesive weight/Total
- 1 : 1.27
- Tractive force/Heating surface
- 1 : 13.11
- Grate area/Heating surface
- 1 : 52.37
- Firebox/Tube surface
- 1 : 14.33
