An An and Yin-Long (Mandarin: 安安和尹龙 or 安安和尹龍) are two Chinese coaches Thomas meets during his visit to China. They usually work with Hong-Mei and Thomas during his Chinese passenger runs, but on occasion, Yong Bao pulls them.
Both these coaches are full of cheerfulness that can really bring out an engine's friendliness, and due to working all around China, they have a large amount of knowledge on their country's routes.
An An and Yin-Long are based on the LB&SCR Stroudley coaches.
An An and Yin-Long are painted teal green with yellow wheels and lining.
- Some promotional articles for the twenty second season refer to Yin-Long as ZiLong while the 2019 annual refers to him as Lin Yong.