Questions on the DDA40X

Discussion about the Union Pacific operations past and present. Official site can be found here: UPRR.COM.

Moderator: GOLDEN-ARM

Questions on the DDA40X

Postby Railman20 » Fri Sep 02, 2016 6:37 pm

Hi everyone I'm new here and I apologize if these questions have been asked before so without further ado, here are my questions. Are the trucks on the DDA40X powered simulatneously by both engines s ( power from each engine going to both trucks.) or does each engine power a respective truck (Front egnine powers front truck and back engine powers back truck or back engie powers front truck and front engine powers back truck). Also can it be run with one enigne powering both trucks as a means of saving power when pulling light trains. I have tried looking online for the desired information but the closest I found was this ( ) but only mentions the DDA40X once and provides vague information on how the trucks work.
User avatar
Posts: 1
Joined: Tue Aug 30, 2016 10:32 pm
Location: central Florida, USA

Re: Questions on the DDA40X

Postby John_Perkowski » Sat Sep 03, 2016 8:34 pm

Moderators Note:

Moved to Union Pacific forum.
~John Perkowski: Moderator: General Discussion: Locomotives, Rolling Stock, and Equipment
Assistant Administrator:
Please don't feed the spammers! If you see spam, please notify a Moderator
User avatar
Posts: 4607
Joined: Wed Mar 17, 2004 5:12 pm
Location: Off the Q main near Parkville MO

Re: Questions on the DDA40X

Postby NorthWest » Sat Sep 03, 2016 10:24 pm

Each prime mover was connected to one main generator and the four traction motors on one truck. The front prime mover was connected to the front truck. It was mechanically two independent regular units on one frame.

Caution large file:
User avatar
Posts: 459
Joined: Tue Jul 15, 2014 1:54 pm

Re: DDA40X

Postby timz » Tue Sep 06, 2016 5:28 pm

Powering all eight traction motors from one alternator would involve enough pointless complication that I'm guessing it's out of the question. Most likely no mention of it in the operator manual
Posts: 1709
Joined: Fri Mar 12, 2004 1:04 pm
Location: Oakland CA

Re: Questions on the DDA40X

Postby NorthWest » Tue Sep 06, 2016 8:16 pm

From page 10/101:
The General Motors Model DDA40X locomotive, illustrated in Figs. 0-1 and 1-1, is designed for heavy duty mainline service. It is equipped with two separate and independent power units. Each power unit consists of a 3300 horsepower 16 cylinder turbocharged diesel engine directly connected to a main generator which delivers power to four traction motors, each of which is geared to an axle and pair of driving wheels. The four traction motors are located in a single truck. Power from the No. 1 engine is directed to the No. 1 truck and power from the No. 2 engine to the No. 2 truck.
User avatar
Posts: 459
Joined: Tue Jul 15, 2014 1:54 pm

Return to Union Pacific

Who is online

Users browsing this forum: No registered users and 1 guest