Can you please try like this:

$line ={'Station1'=>{'x'=>'','y'=>'','z'=>},
        'Station2'=>{'x'=>'','y'=>'','z'=>}
       }
[download]

similarly if you start from line:

$line ={'line1'=>={'Station1'=>{'x'=>'','y'=>'','z'=>},
        'Station2'=>{'x'=>'','y'=>'','z'=>}
       },
       'line2'=>{'Station1'=>{'x'=>'','y'=>'','z'=>},
        'Station2'=>{'x'=>'','y'=>'','z'=>}
       }
       }
[download]