1track (for trains etc)
2orbit (of a satellite)
3(fig.) a person's established path in life
4desired trajectory (of a business or other endeavor)
5(audio engineering) track
6(quantum mechanics) orbital
Examples
wǒ我de的shēng yi生意zhōng yú终于shàng上le了guǐ dào轨道。
我的生意终于上了轨道。
My business has at last gotten on the right track.
你在正确的轨道上。
You're on the right track.
到5号轨道乘随便什么火车。
Take any train on track 5.