Answer:

transit

Answer	Crossword Clue
TRANSIT	Rapid .. (urban trains)
TRANSIT	Mass ..
TRANSIT	On its way, after "in"

TRANSIT	What mailed packages are in?
TRANSIT	The "T" of MTA
TRANSIT	It may be rapid
TRANSIT	Mass or rapid follower
TRANSIT	Planes, trains, and automobiles
TRANSIT	Passage
TRANSIT	Mass .. (buses et al.)
TRANSIT	Migration

TRANSIT	Subways, buses et al.
TRANSIT	Surveyor's device
TRANSIT	Buses and trains
TRANSIT	Mayor's concern
TRANSIT	Pass through
TRANSIT	Mass .. (buses and trains)
TRANSIT	Surveyor's instrument
TRANSIT	Mistakenly start in carriage (7)

TRANSIT	Conveyance.
TRANSIT	Business of bus and subway.
TRANSIT	Passage from one place to another.
TRANSIT	Subway's function.
TRANSIT	Carriage.
TRANSIT	Surveying instrument.
TRANSIT	Conveyance, as of goods.
TRANSIT	Passage through.

TRANSIT	Passage.
TRANSIT	Rapid ...
TRANSIT	Subways, buses, etc.
TRANSIT	In ... (on the way)
TRANSIT	Surveying instrument
TRANSIT	"Sic ... gloria mundi"
TRANSIT	Train or subway
TRANSIT	Rapid follower

TRANSIT	Theodolite
TRANSIT	Kind of visa
TRANSIT	The Chicago ... Authority
TRANSIT	"The Chicago ... Authority"
TRANSIT	Word with mass or rapid