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"train" is also used as a crossword clue. If that's what you saw, the answer is often discipline (10 letters).
Definitions
exercise in order to prepare for an event or competition
Word origin
From Middle English trayne (“train”), from Old French train (“a delay, a drawing out”), from traïner (“to pull out, to draw”), from Vulgar Latin *traginō, from *tragō, from Latin trahō (“to pull, to draw”), ultimately from Proto-Indo-European *tregʰ- (“to pull, draw, drag”). The verb was derived from the noun in Middle English.
Used in a sentence
“Unfortunately, the leading bridesmaid stepped on the bride's train as they were walking down the aisle.”
“They called each other by their Christian name, were always arm in arm when they walked, pinned up each other's train for the dance, and were not to be divided in the set [...].”
“He was generally seen trooping like a colt at his mother's heels, equipped in a pair of his father's cast-off galligaskins, which he had much ado to hold up with one hand, as a lady does her train in bad weather.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer12 curated clues
01“Locomotive and cars”5 letters
02“Long rail vehicle”5 letters
03“Passenger cars on rails”5 letters
04“Practice for a race”5 letters
05“Practice for competition”5 letters
06“Prepare through practice”5 letters
07“Rail transport”5 letters
08“Railroad vehicle”5 letters
09“Railway vehicle”5 letters
10“Vehicle on rails”5 letters
11“Vehicle running on rails”5 letters
12“Rail vehicle”5 letters
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