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Page views since 2023-01-26: 690892
Southern Pacific classes MK-5 and MK-6
United States | 1913
94 produced
No. 794 on static display at Sunset Depot, San Antonio, Texas
No. 794 on static display at Sunset Depot, San Antonio, Texas
Ironmatic1

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 design and had taller drivers and larger cylinders. 17 of the actual class MK-5 were built by Baldwin and Lima between 1913 and 1917. 20 more which were only built by Lima were designated class MK-6.

The T&NO got a total of 57 MK-5. Most were built by Baldwin, ALCO-Brooks and the SP Algiers shops, with only one delivered from the Houston shops. All of these had disappeared by 1957. Today four MK-5 are still existing, even though none is currently operational. While 771 will remain stationary, 745 and 786 ware being overhauled or restored, while there are plans to do the same with 794.

VariantT&NOSP
General
Built1913-19211913-1917
ManufacturerBaldwin, ALCO, Algiers, HoustonBaldwin, Lima
Axle config2-8-2 (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase35 ft 2 in
Rigid wheelbase16 ft 6 in
Total wheelbase80 ft 2 in
Service weight285,980 lbs280,960 lbs
Adhesive weight213,380 lbs214,020 lbs
Total weight442,080 lbs451,000 lbs
Axle load54,300 lbs54,550 lbs
Water capacity9,000 us gal
Fuel capacity2,940 us gal (oil)
Boiler
Grate area70.4 sq ft
Firebox area235 sq ft242 sq ft
Tube heating area3,739 sq ft3,973 sq ft
Evaporative heating area3,974 sq ft4,215 sq ft
Superheater area865 sq ft890 sq ft
Total heating area4,839 sq ft5,105 sq ft
VariantT&NOSP
Power Plant
Driver diameter63 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 26 x 28 in
Power
Power sourcesteam
Estimated power2,950 hp (2,200 kW)3,000 hp (2,237 kW)
Optimal speed37 mph
Starting effort51,076 lbf
Calculated Values
steam locomotive
freight
last changed: 06/2024
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