Re: D&RGW 346 to head to Durango for 1472 work.

Kelly Anderson Wrote:
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> Earl Wrote:
> --------------------------------------------------
> -----
> > What I don't understand is how a C-18 pulls 12
> > tons (one empty car) more than a C-19. Both
> > classes have 16X20 cylinders. A reboilered
> C-19
> > carries 160 lbs of steam. With the exception
> of
> > 315, all the C-18's carried only 145 lbs. How
> can
> > you haul more with less power?!?
>
> If the C-18 has smaller drivers, that's a point in
> their favor. Also, if the C-18 has more weight on
> the divers. Perhaps the C-19 has a low factor of
> adhesion in comparison and can't put her extra
> boiler pressure to effective work.

C-18s have slightly larger drivers than the C-19s. 38" vs 36-3/4". Who knows why. As Mark said (which is what I told him was my theory.) The main rods are likely the major factor. A loaded down C-19 even with well adjusted shoes and wedges will waddle up grade and ring her own bell. 315 loaded down will hunt/swim side to side bouncing off the rails.

The rocking or waddling of a C-19 probably messes with the loading on the drivers and would then affect the adhesion.

Jeff Taylor
CRRM curator of equipment and rolling stock.