Can I book train ticket on line in advance & collect on arrival?

Of course you can. Here I attach a website for you, where you can book the ticket online. I used it a lot and it really helped.
https://www.travelchinaguide.com/china-trains/
I used to book online and the operators sent the tiekets to my house. So maybe you can get the ticket in the train station.
As for the specific information, you can send an e-mail to: travelchinaguide.com|booking to make it clear.
May help and nice day!