multiple-unit car

17 LETTERS · STARTS WITH M

multiple-unit car is a valid 17-letter word worth 21 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

M3U1L1T1I1P3L1E1-0U1N1I1T1C3A1R1

3 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does multiple-unit car mean?