Train from Suzhou to Pudong airport

Hi. I need to get from Suzhou to Pudong airport. I've checked on the net, and found a train from Suzhou to Shanghai Railway Station, but it is not clear for me the next segment. I saw on the map: Airport Line 5: to Pudong International Airport. Is this Line 5 inside Shanghai railway station? Or is it a better option? Thank you in advance.