Class J's - trackworthiness? UP set up?

[nw-modeling-list at nwhs.org]

UP's FEF's (844) had lateral motion boxes on the first
three axles, allowing for 3/4", 5/16" and 5/16" play
(The Mighty 800, Kratville, p47).  This effectively
reduced their rigid wheelbase, which otherwise would
have been 22' long. 

On the Big Boys, the same setup was used, lateral
motion on the first three axles of each engine (Big
Boy, Kratville, p49).  This reduced the rigid
wheelbase which would have been 18'-3".

The Js did not have this feature, so their 18'-9"
wheelbase was the controlling dimension.

Dave Stephenson

--- nw-modeling-list at nwhs.org wrote:


> Charlie:  Since the track settings are a compromise,

> figure that the ratio

> of 2 to 3 dozen steam excursions per year compared

> to 50,000 -100,000 diesel

> trains per year.  And the diesel trains pay the

> bills?   The excursion

> trains will be slowed down and not run over certain

> tracks.

> 

> Gary Rolih

> 

> -----Original Message-----

> From: nw-modeling-list-bounces at nwhs.org

> [mailto:nw-modeling-list-bounces at nwhs.org] On Behalf

> Of

> nw-modeling-list at nwhs.org

> Sent: Monday, October 02, 2006 12:59 PM

> To: N and W Modeling List

> Subject: RE: Class J's - trackworthiness? UP set up?

> 

> 

> It would be interesting to see how UP sets up their

> track since they operate

> both steam and diesel more often than any other

> modern freight hauling rr.

> Not having drawings in front of me, I'm guessing

> that the Big Boy's rigid

> wheel base is approximate to the J's.

> Charlie Long

> 

>


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