Potential answers for "Part of an underground system"

⭐⭐⭐⭐ SEWER
⭐⭐⭐ MTA
⭐⭐⭐ METRO
⭐⭐⭐ TUBEMAP
⭐⭐ ROOT
⭐⭐ BUSLINE
⭐⭐ FANBELT

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