In swing low, sweet chariot, to what vehicle does the speaker refer?

In examining the lyrics of the song, in general, the speaker is calling on the chariot from the heavens to "carry me home."  This is a call to the divine.  The call to the chariot from above is a plea to the divine to send the vehicle to take the speaker out of the condition from which they exist.  It is a call to transcend what is into what can be.  hope this helps

This is a call to the divine. The call to the chariot from above is a plea to the divine to send the vehicle to take the speaker out of the condition of which they are in.

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