Union Pacific EMD DD40AX Centennial Diesel Locomotives

All releases are included below. 
If you are looking for something specific, not shown below, please use the
Google Search Link here,
or the Google search at the bottom of all pages on our site:

Please remember to give your first and last name and the city and state where you live in all your e-mails.

Non-USA customers please include the country.

EMD DD40AX

EMD DD40AX

UP 6915, preserved by the Southern California chapter of the Railway and Locomotive Historical Society at the Los Angeles County Fairplex in Pomona, California.
Power type	Diesel-electric
Builder	General Motors Electro-Motive Division (EMD)
Build date	June 1969 – September 1971
Total production	47
AAR wheel arr.	D-D
Gauge	4 ft 8½ in (1,435 mm)
Wheelbase	Between truck centers: 65 ft (19.81 m) Truck wheelbase: 17 ft 1.5 in (5.22 m)
Length	98 ft 5 in (30 m)
Width	10 ft 4 in (3.15 m)
Height	cab roof: 14 ft 11.375 in (4.56 m) overall: 16 ft 4 in (4.98 m)
Locomotive weight	545,500 lb (247,400 kg)
Fuel capacity	8,230 US gallons (31,154 L)
Prime mover	2 × EMD 645E3A
Aspiration	turbocharged
Cylinders	V16
Power output	6600 hp (4,900 kW)
Safety systems	Leslie Supertyfon model S5TRRO or S3LR horns
Career	Union Pacific
Nicknames	"Centennial"
Delivered	6900-6924: June–December 1969 6925-6946: June–September 1971
Disposition	1 in service, 45 withdrawn, (12 preserved, 34 broken up)

The EMD DD40AX was a 6,600 hp (4.9 MW) D-D diesel locomotive built by General Motors' Electro-Motive Division of La Grange, Illinois, for the Union Pacific Railroad. 47 locomotives were built between June 1969 and September 1971; they were numbered UP #6900–6946.

The first locomotive, #6900, was delivered in time to participate in the celebrations of the 100th anniversary of the completion of the transcontinental railroad by driving a golden spike at Promontory Summit, Utah. The class was therefore named Centennial by the Union Pacific.

The DD40AX is the longest diesel locomotive design ever built, at 98 ft 5 in (30 m). The locomotive frame length required exceeded the abilities of EMD's plant, so the frames were fabricated by an outside contractor, the John Mohr Company of Chicago. Even today, it is the most powerful diesel locomotive type ever built, although it achieves this by using two diesel prime movers.

The 'X' in the designation stood for Experimental: the DD40AX locomotives were the testbeds for much technology that would go into future EMD products. They pioneered the modular electronic control systems later used on EMD's Dash-2 line of locomotives. For the first time, the locomotive was able to load-test itself, using its dynamic braking resistors as an electrical load so that external equipment was not required. The DDA40X used the wide-nosed cab from the FP45 cowl units. This design closely resembled the Canadian comfort cab used on nearly all hood unit diesels today, but predated it by two decades.

As the DD40AX program was deemed a testbed, a number of experiments were conducted during the service life of these locomotives. One such test included fitting a few of the units with air raid sirens in order to warn trackside personnel when away from grade crossings. These tests were inconclusive, however.

The DD40AX is featured in the third sequel of the successful computer game series Railroad Tycoon under the name "DD40AX".

The engineer's control stand.

Original buyers

Click on any photo for large view

Features:

• DCC-equipped for speed, direction and lighting
• Dual-mode NMRA decoder
• Precision can motor with flywheels
• 12 wheel drive
• Finescale LED headlights (constant lighting)
• Weathered air intakes and exhaust stacks
• Designed for aftermarket sound installation
  

E-Mail your
Order

Earthlink, G-mail, Hotmail,
AOL & Similar e-mail Users
Please Read This Page

E-Mail your
Order

Earthlink, G-mail, Hotmail,
AOL & Similar e-mail Users
Please Read This Page

E-Mail your
Order

Earthlink, G-mail, Hotmail,
AOL & Similar e-mail Users
Please Read This Page

E-Mail your
Order

Earthlink, G-mail, Hotmail,
AOL & Similar e-mail Users
Please Read This Page

E-Mail your
Order

Earthlink, G-mail, Hotmail,
AOL & Similar e-mail Users
Please Read This Page

E-Mail your
Order

Earthlink, G-mail, Hotmail,
AOL & Similar e-mail Users
Please Read This Page

E-Mail your
Order

Earthlink, G-mail, Hotmail,
AOL & Similar e-mail Users
Please Read This Page

E-Mail your
Order

Earthlink, G-mail, Hotmail,
AOL & Similar e-mail Users
Please Read This Page