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Last post 09-20-2006 12:35 AM by tomikawaTT. 13 replies.
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09-19-2006 1:05 AM In reply to
Offline Pathfinder
Top 500 Contributor
Joined on 07-07-2006
Merritt, BC CANADA
Posts 1,140

Re: Have you ever seen something so odd?

Who will be the first to kit bash that?   Big Smile [:D]
09-19-2006 1:08 AM In reply to
Offline Hitsua
Not Ranked
Joined on 08-11-2006
California
Posts 99

Re: Have you ever seen something so odd?

    Only the time I managed to derail every car except he caboose on my Lionel set.

--Austin
09-19-2006 5:58 AM In reply to
Offline jeffrey-wimberly
Top 10 Contributor
Joined on 06-21-2004
Sundown, Louisiana
Posts 12,578

Re: Have you ever seen something so odd?

Could that be an adaptation for tight radius turns?
09-19-2006 6:38 AM In reply to
Offline MAbruce
Top 500 Contributor
Joined on 11-23-2001
US
Posts 1,543

Re: Have you ever seen something so odd?

As the thread later indicates, those units are modified EX-CONRAIL locos operating in Brazil.  Not something one would see on a US railroad - but very interesting none the less.
09-19-2006 7:48 AM In reply to
Offline tpatrick
Not Ranked
Joined on 03-21-2002
Lakewood NY
Posts 464

Re: Have you ever seen something so odd?

The extra axles lighten the load per axle. Having four trucks serves to shorten the rigid wheelbase.
09-19-2006 7:54 AM In reply to
Offline BRAKIE
Top 25 Contributor
Joined on 10-23-2001
OH
Posts 7,038

Re: Have you ever seen something so odd?

A closer  investigation will reveal these  units are now riding on narrow gauge trucks... Shock [:O]Thats  why the truck change.
09-19-2006 9:03 AM In reply to
Offline Dave Vollmer
Top 150 Contributor
Joined on 11-26-2003
Bellevue, NE
Posts 2,669

Re: Have you ever seen something so odd?

 tpatrick wrote:
The extra axles lighten the load per axle. Having four trucks serves to shorten the rigid wheelbase.

Probably significantly reduces the tractive effort as well.
09-19-2006 9:42 AM In reply to
Offline Morpar
Not Ranked
Joined on 04-15-2002
Frankfort, Indiana
Posts 319

Re: Have you ever seen something so odd?

They also have similarly modified SD40-2, SD40T-2, and SD45-2 locos. I was starting to try to build one in standard gauge, but haven't quite figured out how to make the drive work the way I want.

http://www.rrpicturearchives.net/modelList.aspx

To find these photos, scroll down to "Rebuilt EMD". The first locos are these. If anyone has any good ideas on how to bash a respectable drive for one of these, please share!

09-19-2006 10:41 AM In reply to
Offline jrbernier
Top 100 Contributor
Joined on 01-08-2001
Rochester, MN
Posts 3,146

Re: Have you ever seen something so odd?

Dave,

 

  The TE remains the same if the weight is not reduced.  The 'axle loading' is now lower, but the total wieght on the drivers is still the same.  The other advantage is that there are more tractions motors to soak up all of tha electrical energy generated above the frame level.  At low speeds this is an advantage, but becomes a penalty as the speed increases(now you have thirsty traction motors sucking the main generator down).  In most US practice, the axle loading is in the 65,000-70,000 lb range.

 

Jim 
09-19-2006 10:43 AM In reply to
Offline pcarrell
Top 25 Contributor
Joined on 02-17-2005
In the State of insanity!
Posts 7,976

Re: Have you ever seen something so odd?

That is just completely WHACKED!
09-19-2006 10:51 AM In reply to
Offline vsmith
Top 10 Contributor
Joined on 12-20-2001
Smoggy L.A.
Posts 9,246

Re: Have you ever seen something so odd?

Big diesel, narrow track....Cool
 
yep these are modified for narrow gauge, meter gauge to be precise. The double trucks help not to crush the track. If you think these look odd, you should see the modified SD70's and Dash units that have been shipped there, those dwarf the tracks!
09-19-2006 10:57 AM In reply to
Offline Leon Silverman
Top 500 Contributor
Joined on 07-13-2004
Posts 787

Re: Have you ever seen something so odd?

 Dave Vollmer wrote:

 tpatrick wrote:
The extra axles lighten the load per axle. Having four trucks serves to shorten the rigid wheelbase.

Probably significantly reduces the tractive effort as well.

The tractive effort might actually increase if the individual traction motors had the same power as the US gauge traction motors they replaced.  The extra axle would allow more tractive effort to be generated as long as the motors cojuld withstand the current.
09-20-2006 12:35 AM In reply to
Offline tomikawaTT
Top 25 Contributor
Joined on 02-13-2005
Southwest US
Posts 7,240

Re: Have you ever seen something so odd?

 Dave Vollmer wrote:

 tpatrick wrote:
The extra axles lighten the load per axle. Having four trucks serves to shorten the rigid wheelbase.

Probably significantly reduces the tractive effort as well.

Almost certainly reduces the tractive effort PER AXLE.  However, unless the entire locomotive has been lightened (improbable) the TOTAL tractive effort (which is driven by total weight) would remain pretty much the same.

Note that the wide gauge units also have more axles (Do-Do rather than Bo+Bo-Bo+Bo,) presumably out of deference to the inability of Brazilian track structure to handle U.S. axle loadings.

Chuck
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