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maglev is short for Magnetic Levitation.
"Maglev" is.
They get on from an opening passage way that comes out of the maglev train
Magnetism elevates the maglev train because like forces repel. Maglev trains are not suspended, but are elevated.
Yes, maglev trains can be built underground. In fact, the majority of the Chuo Shinkansen maglev line being built in Japan will be underground.