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."

1. The arrangement of instruments and apparatuses for chemical analysis. 2. An arrangement of an apparatus for elementary organic analysis.