[dj-wonk]

Think of shipping as an optimization problem where various modes are selected for different parts of the path. You have to run the optimization problem to see what mix makes the most sense -- and don't expect it to necessarily be simple or obvious.

Logistics is complex; you'll also need to factor many things into the optimization: * both fixed and marginal costs of each mode (e.g. maintaining track, monitoring safety, wear and tear on vehicles, varying fuel costs) * constraints (due to technology, personnel, regulations, etc) * fluctuations in demand and shipping objectives * lots more

If you want to focus on only one slice of the problem... Sure, for the exact same route (meaning that a particular track has already been built), one would expect that trains are more efficient. The data shows that; e.g. https://en.wikipedia.org/wiki/Energy_efficiency_in_transport...