diesel locomotive

NOUN
17 LETTERS · STARTS WITH D

diesel locomotive is a valid 17-letter word worth 24 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2I1E1S1E1L1L1O1C3O1M3O1T1I1V4E1
2 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 3 + 1 + 3 + 1 + 1 + 1 + 4 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does diesel locomotive mean?