Potential answers for "What mostly operates underground in D.C."

⭐⭐⭐⭐ METRO
⭐⭐⭐ DUES
⭐⭐⭐ MOLE
⭐⭐ AIRGUN
⭐⭐ GRINDS
⭐⭐ OPENSOUT
⭐⭐ AIRBRAKE
⭐⭐ THEBBC
⭐⭐ LASES
⭐⭐ HUMS

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