DDA40X
UP DDA40X #6922 at Cody Park; North Platte, Nebraska.
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| Type and origin | |
|---|---|
| Power type | Diesel-electric |
| Builder | General Motors Electro-Motive Division (EMD) |
| Build date | April 1969 – September 1971 |
| Total produced | 47 |
| Specifications | |
|---|---|
| Configuration: |
|
| • AAR | D-D |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Wheelbase | Between truck centers: 65 ft (19.81 m) Truck wheelbase: 20 ft 1 1⁄2 in (6.13 m) |
| Length | 98 ft 5 in (30.00 m) |
| Width | 10 ft 4 in (3.15 m)) |
| Height | cab roof: 14 ft 11 3⁄8 in (4.56 m) overall: 16 ft 4 in (4.98 m) |
| Loco weight | 545,000 lb (247,000 kg) or 260.99 short tons (233.03 long tons; 236.77 t) |
| Fuel capacity | 8,280 US gal (31,300 l; 6,890 imp gal) |
| Prime mover | 2 × EMD 645E3A |
| Engine type | V16 diesel |
| Aspiration | turbocharged |
| Cylinders | 16 |
| Safety systems | Leslie Supertyfon model S5TRRO or S3LR horns, US&S Type 'EL' Cab Signals (#6936 equipped with US&S MicroCab ATC & CCS) |
| Performance figures | |
|---|---|
| Power output | 6,600 hp (4,920 kW) |
| Tractive effort | starting: 113,940 lbf (506.8 kN) @25% continuous: 103,000 lbf (460 kN) @12 mph |
| Career | |
|---|---|
| Operators | Union Pacific |
| Numbers | 6900 – 6946 |
| Nicknames | "Centennial", "Big Jack" |
| Delivered | 6900-6924 April – December 1969 6925-6946 June 1970 – September 1971 |
| Disposition | 1 in service, 46 withdrawn, (13 preserved, 34 scrapped) |
The DDA40X is a 6,600 hp (4.92 MW) D-D diesel-electric built by the General Motors EMD division of La Grange, Illinois for the Union Pacific Railroad. Nicknamed "Centennial" and "Big Jack", the DDA40X uses two diesel engines (each 3,300 hp (2.46 MW)) and is the most powerful single-unit diesel locomotive ever built, although more recent locomotive designs such as the GE AC6000CW and EMD SD90MAC have come close. It is the second most powerful locomotive ever built, losing to the Union Pacific GTEL. It is also the longest single-unit diesel locomotive ever built.
In 1969 Union Pacific was retiring the later gas turbine-electric locomotives. Union Pacific had ordered EMD DD35s and DD35As to replace the turbines, and the DDA40X was a further development. Forty seven were built between June 1969 and September 1971, except the first one delivered in April in time to participate in the celebrations of the centennial anniversary of the completion of the Transcontinental Railroad driving the "Gold Spike Limited" and arriving in Salt Lake City, Utah, on the morning of May 10, 1969. The units were numbered from 6900 to 6946, with 6936 still in service.
The DDA40X is 98 ft (30 m) long. The frames were fabricated by an outside contractor, the John Mohr Company of Chicago, since the frame length exceeded the abilities of EMD's plant. Using more than one prime mover in a single locomotive was not new; the E-series were popular dual-engine locomotives, and Baldwin had produced (but not sold) a locomotive with four diesel engines.
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Wikipedia