Crossword puzzle clue "underground transport systems"

Here are the possible solutions for underground transport systems clue

Answer
Clue
Relevancy
metros
Clue
Underground transport systems
Underground systems
Definition
METRO, an urban railway system running wholly or partly underground
subways
Clue
Transport systems that begin each of the three theme answers
metro
Clue
Paris's underground transport system
Definition
an urban railway system running wholly or partly underground
tram
Clue
Underground transport
tube
Clue
Underground transport
aaa
Clue
Best, in some rating systems
abms
Clue
Mil. defense systems

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