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Southern Pacific classes MK-5 and MK-6
The classes MK-5 and MK-6 consisted of a total of 94 Mikados built for the Southern Pacific and its subsidiary Texas & New Orleans between 1913 and 1921. In contrast to earlier SP Mikados they were a Harriman standard...
| Southern Pacific classes MK-5 and MK-6Remove | |
|---|---|
| Variant | |
| Built | 1913-1921 |
| Manufacturers | Baldwin;ALCO;Algiers;Houston |
| Wheel arrangement | 1D1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 129719 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Southern Pacific classes MK-5 and MK-6Remove |
|---|---|
| Built | 1913-1921 |
| Manufacturers | Baldwin, ALCO, Algiers, Houston |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Southern Pacific classes MK-5 and MK-6Remove |
|---|---|
| Wheelbase | 10.72 m |
| Total wheelbase | 24.44 m |
| Service mass | 129.7 t |
| Adhesion mass | 96.8 t |
| Total mass | 200.5 t |
| Rigid wheelbase | 5.03 m |
| Axle load | 24.6 t |
| Water capacity | 34,069 l |
| Fuel capacity | 11,129 l (oil) |
Boiler
| Property | Southern Pacific classes MK-5 and MK-6Remove |
|---|---|
| Grate area | 6.54 m² |
| Firebox surface | 21.832 m² |
| Tube heating surface | 347.365 m² |
| Evaporative heating surface | 369.197 m² |
| Superheater surface | 80.361 m² |
| Total heating surface | 449.6 m² |
Power plant
| Property | Southern Pacific classes MK-5 and MK-6Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 660 x 711 mm |
Power
| Property | Southern Pacific classes MK-5 and MK-6Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,200 kW (2,991 PS) |
| Starting effort | 227.2 kN |
Calculated values
| Property | Southern Pacific classes MK-5 and MK-6Remove |
|---|---|
| Factor of adhesion | 1 : 4.18 |
| Optimal speed | 60 km/h |
| Power-to-weight ratio | 17.0 kW/t |
| Heating Surface Equivalent | 639.1 m² |
| Cylinder volume/HSE | 1 : 762.38 |
| Adhesive weight/Total | 1 : 1.34 |
| Tractive force/Heating surface | 1 : 10.56 |
| Grate area/Heating surface | 1 : 68.74 |
| Firebox/Tube surface | 1 : 15.91 |
| Total/Superheater | 1 : 4.59 |
