A rail company owned by the Spanish state. Until 2021 Renfe held a monopoly on Spain's high-speed rail network, the world's second longest. Since then Iryo, a company led by Trenitalia (Italy's state-owned rail operator), and a French rival have entered the market, and traffic on the busiest lines has surged by up to 70% as prices have fallen.
If you can count your money, you don't have a billion dollars.