I'm on my phone right now so I can't post nice details, but the Wikipedia number for "Portugal" is mislabeled. Per the reference, that is just for the Lisbon r

I'm on my phone right now so I can't post nice details, but the Wikipedia number for "Portugal" is mislabeled. Per the reference, that is just for the Lisbon rail system. The US DOE report the US number was sourced from averages all passenger rail systems in the US, and specifically notes significant system-to-system variance. The biggest variance is that the Lisbon numbers are based on an average of about 400 passengers per train kilometer, while the US averages only about 40 across all systems.