What does "subway" mean in English for Spanish?

In English for Spanish, "subway" means:

metro

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

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

• English for Spanish 4, Level 2, Scene 4
• English for Spanish 4, Level 2, Scene 5
• English for Spanish 4, Level 1, Scene 2