train indicator

15 LETTERS · STARTS WITH T

train indicator is a valid 15-letter word worth 17 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

T1R1A1I1N1I1N1D2I1C3A1T1O1R1

1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 2 + 1 + 3 + 1 + 1 + 1 + 1 =17 PTS

DOUBLE WORD → 34TRIPLE WORD → 51

MEANING

What does train indicator mean?