OK, I can understand it at this level. If you ordered a car, you
paid a minimum weight regardless of how small your shipment was. As
your shipment weight went up, the rate slid up accordingly.
Relating this to a model railroad, I may have to run two 40 ton
cars to a siding if I decide that there is no 50 ton car available
Of course, as my brain runs off on a tangent to this, (and this
is a BIG jump!), taking a look at the USRA cars: If the technology
had developed to the point where the 50 ton car was practical, why
didn't the USRA simply standardize on the 50 ton car? Instead, they
had standard designs in both 40 AND 50 tons capacity?
It appears you are talking about a carload rate, so we also needto
know the minimum carload weight for widgets. If we are less thenthe
carload weight, we still pay for that minimum weight. If we areover
we payu by the hundred weight. As long as our volume of widgetsfits
the car provided, we are fine. If we requested a car based onvolume,
then some exceptions take place.100,000
lb car and had that weight to ship, and the railroad provided a80,000
lb car, the additional 20,000 lb could be loaded in another car andconveniance
of the railroad.loading.