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The materials being a fire hose that sprays money everywhere. Shit's expensive dawg, and its totally incompatible with existing rail networks, a much bigger step up from steam to diesel or electrification.
The best we can hope for (and actually what transrapid would be most suited for) is a small number of dedicated transrapid lines on shuttle and commuter services.
I've seen people ranting about replacing entire networks with mag-levs, but thats just stupid, the real world isn't Transport Tycoon.