[FredPret]

With freight, if you consider all factors, road is much more efficient for all but bulk loads or edge cases.

You can make more economical runs per month with trucks than with trains, meaning you get to have less stock on hand as a buffer on both ends.

This has many knock-on efficiencies - fewer resources tied up in goods, lower insurance expense, lower warehousing cost, and above all: a more flexible and responsive supply chain.