轨道交通

metro / rapid transit / subway

course / path / track / rail

track (for trains etc) / orbit (of a satellite) / (fig.) a person's established path in life / desired trajectory (of a business or other endeavor) / (audio engineering) track / (quantum mechanics) orbital

road / path / CL:條|条[tiao2],股[gu3] / principle / truth / morality / reason / skill / method / Dao (of Daoism) / to say / to speak / to talk / classifier for long thin things (rivers, cracks etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process / (old) circuit (administrative division)

to hand over / to deliver / to pay (money) / to turn over / to make friends / to intersect (lines) / variant of 跤[jiao1]

to be connected / traffic / transportation / communications / liaison

to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc

classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)

light rail / transit system (underground, at street level or elevated) / streetcar / metro / abbr. to 輕軌|轻轨[qing1 gui3]