Your bank can issue it. I've done it a BOC. Called 银行汇票 in Chinese.

I'm not currently planning any domestic train travel, but the above information is good to know.

I don't know how far in advance. Think I recall that it has changed.

Do you know what's the latest on that?

It is at Number 10 Wenchang Road. 文昌路10号。 This is a small street that enters the north side of Yi Er Yi Dajie 一二一大街 between Dongfeng Donglu 东风东路 and Beimen Jie 北门街。

You can see it on Baidu Maps by typing in the search phrase" 昆明市一二一大街火车票售票处"。

There are many others in central Kunming a short bus ride away if you cannot locate that one.

This is the one I described a couple years back for someone else. It's real easy to find. Read back in the thread for more about it.

www.17u.com/train/TrainTicketSaleDetail-2437.html

Stands for 余额 (yu2 e2.)