Nobody seems to have figured out how to make bridging the Darién Gap cost effective. https://en.wikipedia.org/wiki/Dari%C3%A9n_Gap#By_land https://en.wikipedia.

Nobody seems to have figured out how to make bridging the Darién Gap cost effective. https://en.wikipedia.org/wiki/Dari%C3%A9n_Gap#By_land https://en.wikipedia.org/wiki/Dari%C3%A9n_Gap#By_land Plus, there's not even any rail line reaching Panama. The southern terminus of the North American rail infrastructure is Mexico, I think. I doubt trucking everything through Central America would be very cost effective. So you're not only building a new line through 66 miles of some of the most difficult and remote terrain in the world, you're building or refurbishing another ~1500+ miles of rail. And then you're only reaching Columbia and Venezuela, with the Andes and the Amazon between you and the two biggest markets in South America: Brazil and Argentina. It would be cool if it happened, but I think it would have to be a regional public works project funded primarily by the U.S. government. Unless Musk is looking for his next challenge (and he can make it pencil out with his Fermi-math voodoo). Maybe the U.S. can sell it to taxpayers as a jobs and economic development program to stem the tide of Central American refugees.