1. A number of connected railroad cars pulled or pushed by one or more locomotives: "The train pulled into the railroad station on time."
2. A long part at the back of a gown or robe which trails on the ground: "Catherine Middleton was wearing a wedding dress on April 29, 2011, with a full skirt and a train which measured almost nine feet.
3. A group of people, vehicles, or animals which are moving in a line: "A funeral train followed the body to the grave where it was to be buried."
4. An orderly series of related thoughts, events, actions, or ideas: "She lost her train of thought when she was interrupted."

1. To teach someone the skills needed to do something; especially, through practical experiences: "The supervisor was training the woman to take over his job when he would retire."
2. To cause someone or something to develop an ability or skill: "The student trained his mind to think in a systematic and scientific way."
3. To make someone stronger, faster, or better at doing something before competing in an event or competition: "The young woman is training for the Olympics."
4. To teach an animal to obey commands: "The police used trained dogs to sniff out drugs."
5. To aim or to point something toward something or in a particular direction: "She trained the flashlight into the cave."
6. To improve something; especially, the mind, with discipline: "They trained their minds to learn the proper pronunciations and vocabulary of the foreign language."