Rich Hunn Wrote:
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> To Jerry's question, NO! To George's comment, the
> 1744 has dragged a lot more than that up La Veta
> which is way steeper than the standard gauge line
> to the Big Trees. Tom, I'm sure your data is
> correct (at least in writing) but it makes no
> sense. At 20% adhesion that puts the engine at
> about
> 165,000 lbs, seems a little light. And Ken, buzz
> off!! Get that C-10 out of the Orland Fair Grounds
> and run it!!

Rich, that series of Moguls did indeed weigh near 165,000 lbs. (166,320), but part of
that was on the pony truck. Actual weight on drivers was 144,120 lbs.
Generally figure on rod engines as having about 4X weight on drivers vs. t.e. This was the
old industry axiom that was generally adhered to. Does that mean that a heavier engine
with, say a factor of adhesion of 4.02 will not ever slip? Of course not. Just a
guideline.
A lot depended on profiles too and company thinking. Ever wonder why that Frisco 1522
hardly ever slipped, even with really long passenger consists? Her factor of adhesion was
way up there over 4.3 IIRC. Good thinking on their part. Conversely, Texas and Pacific
2-10-4's were really light on their feet with something like 3.69 f.e. They frequently
needed help in starting trains out of yards.
Getting back to the original thought on SP Moguls...I'm not saying that they couldn't pull
anything. But, as far as SP freight engines go, they were just about the lightest in later
years.