I went to the Wuyi Lu ticket office (www.gokunming.com/en/listings/item/33081 ) and they said:
- you need a Chinese ID card to buy long distance bus tickets there. Can't do it with a passport.
- you can buy a train ticket there with your passport.
- you cannot get your train tickets bought online with a passport there, you'll need to go the train station.
Looks like it's moving again to another location: passed by there yesterday and people were selling stuff in the streets but not in the market anymore. Some security guy told me it was moving to some place near the train station...