They uncoupled the passenger cars from the train engine.
他们让乘客车厢与火车头脱离开。
《柯林斯英汉双解大词典》
2
The two Irishmen watched them go, then climbed into the black Mercedes - the young one behind the wheel, the older man in the passenger seat. The finely tuned engine purred to life.
By November, and perhaps as soon as September, the Chevy Volt - an electric passenger car that goes 40 miles on a charge before a range-extending gas engine kicks in - will appear in dealer showrooms.