Real Dictionary

train in American English
something that hangs down and drags behind
intransitive verb: to give the discipline and instruction, drill, practice, etc., designed to impart proficiency or efficiency
noun: a self-propelled, connected group of rolling stock
transitive verb: to develop or form the habits, thoughts, or behavior of (a child or other person) by discipline and instruction

train in British English
noun: a line of coaches or wagons coupled together and drawn by a railway locomotive
verb: to guide or teach (to do something), as by subjecting to various exercises or experiences

train noun uses
A train is a number of carriages, cars, or trucks which are all connected together and which are pulled by an engine along a railway. Trains carry people and goods from one place to another.
A train of thought or a train of events is a connected sequence, in which each thought or event seems to occur naturally or logically as a result of the previous one.
countable noun: A train of vehicles, people, or animals is a long line of them travelling slowly in the same direction.
countable noun: The train of a woman's formal dress or wedding dress is the long part at the back of it which flows along the floor behind her.

train verb uses
verb: If someone trains you to do something, they teach you the skills that you need in order to do it. If you train to do something, you learn the skills that you need in order to do it.