train upon

10 LETTERS · STARTS WITH T

train upon is a valid 10-letter word worth 11 points in Scrabble and 15 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

T1R1A1I1N1U1P3O1N1

1 + 1 + 1 + 1 + 1 + 0 + 1 + 3 + 1 + 1 =11 PTS

DOUBLE WORD → 22TRIPLE WORD → 33

MEANING

What does train upon mean?