Not available at Pudong Airport. You can take airport shuttle bus Line 5 to Shanghai Railway Station first. If it is not in holidays, it will not takes long time to get the train ticket at the railway station. There are nearly one hundred trains every day from Shanghai to nanjing, including many bullet trains. You should pay 1500RMB for the taxi fare from Pudong Airport to Nanjing. That's too expensive, isn't it?!