Does take the station use 6 rounds of game play or no limit on rounds??

If it isn't explicitly specified I'd say that it follows the rule of the 6 round battle

States Normal Rules as modified by scenario rules. Round number is not modified explicitly, so it remains at 6

We played it two times with 6 rounds limit. Seemed less exciting at the beginning, but became great fun when all met at the station!

Really hoping ffg will release new 4+ player formats or ideas soon. Quick and fun alternative to playing armada. Also the AOO from cc is easily modifiable to become a 6-player one time battle