Wikipedia
Mantrip
A mantrip is a shuttle for transporting miners down into an underground mine at the start of their shift, and out again at the end. Mantrips usually take the form of a train, running on a mine railway and operating like a cable car. Mantrips may also be self-powered, for example by a diesel locomotive. Other types of mantrips do not require a track and take the form of a pickup truck running on rubber tires.
Because many mines have low ceilings, mantrips tend to have a reduced height.
In the United States, the Mine Safety and Health Administration has published safety regulations governing the operation of mantrips.