Train System That Operates Underground

This page is the CodyCross answer for the clue below from Top Secret, Group 2081, Puzzle 5 (Spy Network).

Question is: Train System That Operates Underground

and the answer is: SUBWAY

Word Meaning:

SUBWAY — (Canada, US, Scotland, South Africa) An underground railway, especially for mass transit of people in urban areas.

Definitions from Wiktionary.

Train System That Operates Underground - Top Secret CodyCross Answers | CodyCross Solutions