From the Guardian in the UK: Graduate tax to replace tuition fees for university students . So instead of paying tuition now, graduates would pay a higher tax later to pay back the loan for their education. So they would pay based on economic benefit received (higher income) rather than on the input (cost). Government, rather than students, assumes the risk that education is economically worthwhile. An interesting idea worth following.
Cameron Booth maps Amtrak as a Subway Map. He also has done maps of the US Interstate Highway system similarly. The network structures are very different.