Let's start basic, we don't want anyone to get overwhelmed. How about the high-speed line in Morocco, Africa? (186km/115mi long HSR section at up to 320km/h / ~200mi/h)
You're right, it's a strange way to refer to a country, I only wrote it that way to emphasize the fact that an African country already has more HSR than the US. The truth is that many outsiders still carry a default impression of Africa as just desert and savannahs and TV ads asking for donations to famine-striken villages, rather than a diverse continent with some impressive cities and growing modern infrastructure already. Western mainstream media doesn't really expose us to Africa often beyond war and conflict news, and wildlife documentaries.