observation train

17 LETTERS · STARTS WITH O

observation train is a valid 17-letter word worth 21 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

O1B3S1E1R1V4A1T1I1O1N1T1R1A1I1N1

1 + 3 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does observation train mean?