What does "Do you know the track number?" mean in English for Spanish?

In English for Spanish, "Do you know the track number?" means:

¿Sabe el número de vía?

Listen to "Do you know the track number?": (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 3, Level 3, Scene 9