Versions of "Nine Hundred Miles" contain the lines:

    I will pawn you my watch,
    I will pawn you my chain,
    Pawn you my gold diamond ring.
    If that train runs me right,
    I'll be home tomorrow night;
    I'm nine hundred miles from my home,
    And I hate to hear that lonesome whistle blow.
    It's that long, lonesome train a-whistlin' down.

Could that be what you heard?