Southern Railway (USA) class Ms
originally class K
The first Mikados that the Southern Railway procured were initially called class K and later renamed Ms. Between 1911 and 1914, a total of 135 units were delivered directly to the Southern by Baldwin and ALCO-Richmond. Together with the subsidiaries, the total number reached over 180, even if some locomotives there had differences.
The fireboxes of the locomotives were prepared directly by the manufacturers to accommodate arch tubes, but these were only installed later. Some were equipped with tractor tenders specifically for Saluda, the seven most successful of which were designated the Ms-2 class. The number 4501, which was used for special trips from 1966, is still operational today at the Tennessee Valley Railroad Museum.
Technical data
General
- Built
- 1911-1914
- Manufacturers
- Baldwin, ALCO
- Wheel arrangement
- 2-8-2 (Mikado)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 10.59 m
- Total wheelbase
- 20.43 m
- Service mass
- 123.8 t
- Adhesion mass
- 97.8 t
- Total mass
- 193.2 t
- Rigid wheelbase
- 5.03 m
- Axle load
- 24.9 t
- Water capacity
- 90,850 l
- Fuel capacity
- 3.6 t (coal)
Boiler
- Grate area
- 4.952 m²
- Firebox surface
- 19.695 m²
- Tube heating surface
- 280.475 m²
- Evaporative heating surface
- 300.17 m²
- Superheater surface
- 64.939 m²
- Total heating surface
- 365.1 m²
Power plant
- Driver diameter
- 1,600 mm
- Boiler pressure
- 12.1 bar
- Expansion type
- simple expansion
- Cylinders
- two, 686 x 762 mm
Power
- Power source
- steam
- Estimated power
- 1,641 kW (2,231 PS)
- Starting effort
- 229.7 kN
Calculated values
- Factor of adhesion
- 1 : 4.18
- Optimal speed
- 43 km/h
- Power-to-weight ratio
- 13.3 kW/t
- Heating Surface Equivalent
- 528.5 m²
- Cylinder volume/HSE
- 1 : 1,065.14
- Adhesive weight/Total
- 1 : 1.27
- Tractive force/Heating surface
- 1 : 13.14
- Grate area/Heating surface
- 1 : 73.73
- Firebox/Tube surface
- 1 : 14.24
- Total/Superheater
- 1 : 4.62
