I know maglevs look cool and all, but there are quite practical reasons why they didn't pan out. One thing people tend to overlook is that regular rail lines are much more versatile. Regular rail can handle a variety of loads - the French high speed rail system also handles postal mail for instance. If you are building rail lines you already have a ton of kit that can use them - such as all the service machinery. Build a maglev and you can throw away all your expensive line maintenance vehicles.