English
trainful
From train + -ful.
Formed from train + -ful
Latin trahō ‘to pull, to draw’
…
Vulgar Latin *traginō
Old French trainer ‘to pull out, to draw’
Old French train ‘a delay, a drawing out’
Middle English trayne ‘train’
English train
Today it means
noun The quantity contained in a train.
Language periods are conventional ranges, not dates for this word.
Etymograph / trainful