What does "the subway" mean in English for Spanish?

In English for Spanish, "the subway" means:

el metro

Listen to "the subway": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 4, Level 2, Scene 5
• English for Spanish 4, Level 2, Scene 4