Transport systems that begin each of the three theme answers

Question:

Answer:

SUBWAYS

Length:

Similar Crossword Questions:

Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
Common easy crossword theme answers
Struck out, as one letter in each of this puzzle's theme answers
What the theme answers can do
Any of five that begin this puzzle's longest answers
Big, and word that is found in all three theme answers
Compound found in perfume and this puzzle's theme answers
The pairs of letters inserted into each of this puzzle's theme answers, for example
Word providing a hint to the hidden theme answers
Attendance check, and a hint to the puzzle theme in the first words of the starred answers
Each of the titles in this puzzle's theme answers, e.g.
Jump online, or a hint to the long theme answers
Classic ad line, and question you need to answer to find the hidden theme in four starred answers
Second letters of this puzzle's five theme answers (seen in order)
Rumored reason for the stock market plunge of 5/6/10, whose effect is seen in this puzzle's theme answers
When spelled out, word that follows the beginnings of the starred answers in a memorable kids' show theme song
Proper sort ... or a cry upon solving each of this puzzle's theme answers?
Word before the first word in this puzzle's theme answers
Weather Channel feature (it's the puzzle theme found in a quintet of answers)
___ to school . . . or a hint to the puzzle theme suggested by the ends of five answers
Feature of this puzzle's theme answers?
Devices that, when turned, adjust themselves (just like the theme answers)
1997 Kevin Kline film, and a hint to the puzzle theme hidden in four answers
Brief time (found in all four theme answers)
What the answers to asterisked clues begin with