The man who answered you knows nothing about train travel. Don't believe him, the train he said is Guangzhou Railway, which has the worst bottom, long running time and high fare.
From Guangzhou to Xiamen, if it is a K232 train, this train is the first choice! This train belongs to kunming railway administration.
New car bottom, short running time and cheap fare. Very cost-effective!
K232 (Kunming-Xiamen) stops at Guangzhou East and Guangzhou East, and picks up the ticket at night 19: 30.