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)
"Something you would cheat on if you knew you wouldn't get caught." "___" (also, the source of this puzzle's theme answers)
1997 Kevin Kline film, and a hint to the puzzle theme hidden in four answers
Item with features that begin this puzzle's four longest answers
Big letters, for short (and what your answers must be written in to understand the theme)
Reservoir, and hint to puzzle theme found in seven long answers
Wise guys featured in this puzzle's theme answers
Word appearing in all nine theme answers
Jump online, or a hint to the long theme answers
Country common to the theme answers
Rhyme runaway, and how this puzzle's theme answers are formed?
Big, and word that is found in all three theme answers
Second letters of this puzzle's five theme answers (seen in order)
Element of surprise in this puzzle's theme answers
Term for each of the 15 asterisked theme answers in this puzzle
The pairs of letters inserted into each of this puzzle's theme answers, for example
Where everything from the theme answers collects
They swing up and down in this puzzle's theme answers
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
Transport in Duke Ellington's theme song
"The wart stops here" product, and a hint to the theme found in eight puzzle answers
Classic rap outfit whose more famous members are circled in this puzzle's theme answers
Devices that, when turned, adjust themselves (just like the theme answers)
Grate, with "get," or what this puzzle's theme answers get