There's several ways a manufacturer can deal with drivers.

1: Correct driver size and space out axles to compensate for flanges.  This is 
the least desirable, it may require "stretching" the locomotive to look right.

2: Correct axle spacing, correct driver size, blind center drivers. 

3: Correct Axle spacing, undersize drivers, enough to compensate for all wheels 
flanged.

But, all is not lost.  There is some built in leeway.  There is some space 
between the flanges on the prototype.  Prototype wheels not flange-to-flange 
with no space inbetween.

On the N&W Y6b 2-8-8-2 for example, the driver size was 58".  The axles were 
spaced 63" apart.  That's a whole 5"(a little less than 3/32" in S)to play with.

Rich G(ajnak)

--- In [email protected], Robert Lampe <danceswithwolves49@...> wrote:
>
> Changing hi-rail wheels for scale in a diesel wouldn't be so bad but it would 
> seem to me that the drivers on a steamer would present a problem. The side 
> rods would have to be made anew in order to fit unless the drivers tire 
> diameter itself were of a scale diameter to begin with. When i was in HO a 
> lot of foreign imports used high flanges on the wheels this presented a 
> problem when running on code 70 rail which was the norm back then for scale 
> appearance. the flanges rode on top of the ties so a lot of guys who had the 
> means turned the flanges or else bought custom drivers  or replaced wheels 
> with those that had smaller flanges. 
> 
> To: [email protected]
> From: brian__jackson@...
> Date: Sat, 22 Dec 2012 17:14:39 +0000
> Subject: {S-Scale List} Re: The Y3
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>  
> 
> 
> 
>   
> 
> 
>     
>       
>       
>       I bet Jim Kindraka has experience in this and can explain. 
> 
> 
> 
> Brian Jackson
> 
> --- In [email protected], "Brian Jackson" <brian__jackson@> wrote:
> 
> >
> 
> > Bob,
> 
> > 
> 
> > I'm pretty sure even brass locos designed for Code 110 operation from the 
> > outset use larger spacing between drivers than the prototype. So maybe 
> > there is already built-in slack?
> 
> > 
> 
> > Brian Jackson
> 
> >
>




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