• Read the file line by line
• If the line is a station identifier, save it off into (say) $state{ 'station' }
• Likewise store off $state{ 'N' } for the other lines as they're encountered
• When you find the end of a record (presumably by hitting a blank line), print the current %state and clear it.
• Lather, rinse, repeat.

Alternately if your records are delimited by blank lines you could diddle $/ and process the whole record at a time.

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