travel without passport

Dear all,
I applied for my residence permit today, means, my passport is with the registration process now and I can not show it to the officer when buying a train ticket. However, I need to travel to Shanghai from Jiangsu Province and I am wondering how to do that. I already got my Alien Employment Permit, together with a copy of my passport, would that work?

Would be happy about any advice how to buy the train ticket "without passport". (The buying process is familiar to me, I did it a lot.) Thank you!

Cheers,
Tina