Wiktionary
train up
vb. (context transitive English) to train or educate with skills needed to perform a task
Usage examples of "train up".
The train blasted its steam whistle, and he and Longarm could hear the couplings strain as the big drivers that had pulled the train up the mountain began to roll forward.
They won't train up to T'swa standards, but they should prove a lot more satisfactory than any army regiment we have.
Afterward on the train up to Sheffield Maya gabbled with nervous relief, face flushed, eyes brilliant, hand clutching his arm as she threw her head back abruptly and laughed.