What is the meaning of the word "train"?

Definitions:

a series of consequences wrought by an event noun
- it led to a train of disasters
cause to grow in a certain way by tying and pruning it verb
- train the vine
create by training and teaching verb
- The old master is training worldclass violinists
exercise in order to prepare for an event or competition verb
- I am training for the Olympics.
piece of cloth forming the long back section of a gown that is drawn along the floor noun
- The train of the gown was carried by two young niblings.
public transport provided by a line of railway cars coupled together and drawn by a locomotive noun
- express trains don't stop at Princeton Junction
teach and supervise (someone) verb
- act as a trainer or coach (to), as in sports
undergo training or instruction in preparation for a particular role, function, or profession verb
- They were training to be teachers.
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed noun
- The fool got their tie caught in the geartrain.