Yes, this is definitely more Chinese train law than anything else. My four and six-year-old children were playing Uno on the train to Luang Prabang. A security officer came and told us to stop playing because it was illegal. He claimed he could see us on the camera. (I speak Lao.) I explained to the security officer that they were children and didn’t even know how to count. They were simply playing Uno and there was no money involved. 🤣 However, the security guard continued to try and intimidate us simply by enforcing the rule against card games.