Krauss-Maffei ML 4000 C'C'
SP 9011 at Enzen, August 1964
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| Type and origin | |
|---|---|
| Power type | Diesel-hydraulic |
| Builder | Krauss-Maffei |
| Model | ML-4000 |
| Build date | 1961–1969 |
| Total produced | 21 North America, 16 South America |
| Specifications | |
|---|---|
| Configuration: |
|
| • AAR | C-C |
| • UIC | C′C′ |
| Gauge |
4 ft 8 1⁄2 in (1,435 mm) (USA), 1,000 mm (3 ft 3 3⁄8 in) (Brazil) |
| Length | 67 ft 7.625 in (20.62 m) |
| Loco weight | 344,000 lb (156 t) |
| Prime mover | Two Maybach MD870 V16s |
| Engine type | Four stroke diesel |
| Aspiration | Turbocharger |
| Cylinders | 32 (two V16s) |
| Cylinder size | 7.28 inches (18.5 cm) bore × 7.89 inches (20.0 cm) stroke |
| Transmission | Voith L830rU hydraulic |
| Loco brake | Schedule 26L air |
| Performance figures | |
|---|---|
| Maximum speed | 70 mph (110 km/h) |
| Power output | 3,540 hp (2,640 kW) (Germany), 3,540 hp (2,640 kW) (USA) |
| Career | |
|---|---|
| Operators | Southern Pacific Railroad, Denver and Rio Grande Western Railroad, Estrada de Ferro Vitória a Minas |
| Nicknames | "(Damned) Krauts", "Amerika-loks", "Amilok", "Ami" |
| Locale | North America, Brazil |
| Retired | 1968 (SP and D&RGW units), 1980 (EFVM units) |
| Preserved | SP 9010 |
The Krauss-Maffei ML 4000 C′C′ is a diesel-hydraulic locomotive, built between 1961 and 1969 by German manufacturer Krauss-Maffei in Munich, Germany. It generated 3,540 horsepower (2,640 kW) from two Maybach V16 engines. 37 examples were built for two North American railroads and one South American railroad.
In 1959, General Motors’ Electro-Motive Division (EMD) rebuilt nine of its GP9 locomotives for the Union Pacific Railroad with pre-production examples of a new turbo-supercharging system that would raise the locomotives’ horsepower to 2000. This soon evolved into the GP20.
The Southern Pacific Railroad (who served much of the same territory as UP, a rival) took this into account, as business for SP was growing rapidly. Freight trains were getting longer and heavier, and SP had to use up to nearly 10 locomotives to power long-distance freight trains. SP's main workhorses at the time were EMD F7s and GP9s. Although SP had a small fleet of 2,400 horsepower (1,800 kW) H-24-66 "Train Master" locomotives manufactured by Fairbanks-Morse, SP found that they were found not suitable for freight service and were relegated to the San Francisco Bay Area's Peninsula Commutes.
After much research, SP decided to experiment with diesel-hydraulic locomotives and stunned the railroading industry by purchasing three 3,540 horsepower (2,640 kW) ML-4000 type locomotives from German manufacturer Krauss-Maffei. Delivered by ship and unloaded at the Port of Houston, Texas on October 31, 1961, they featured two Maybach V16 1,770 horsepower (1,320 kW) diesel engines and Voith transmissions. The Denver and Rio Grande Western Railroad also ordered three units, but found them unsuitable in mountain service, and they were sold to the SP in early 1964. Upon arrival, a special track was set up at the locomotive shops in Roseville, California just for servicing the ML-4000s.
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Wikipedia