moving.

The Guadalquivir is the only navigable great river in Spain.
Although it flows through Cordoba, it is navigable up to Seville only.
It is a primary reason Seville, a city build upon Cortes' & Pizarro's plunders, became the hub for expansion into Colombus' New World.

The AVE train which can run at 300 km/h (186 mph)
between Seville & Madrid.
using the (European) standard guage track.

A goods train
not so fast, but probably more valuable,
using the Spanish broad-guage track