Answers: it isn't called an aboveway train as it still runs on its underground tracks. A apt example of this is the London Underground, which has masses miles above ground, but not whole lines. The lone reason the tracks come above ground is to set free money or lack of suitable boring stuff underground.
A bit like why isn't an umbrella call a rainbrella.
:D
For the same judgment that you call a submarine a submarine even when it is roughly speaking water
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