An An and Yin-Long

An An and Yin-Long (Mandarin: 安安和银龙/銀龍) are two Chinese coaches who help transport passengers on the China Railway.

Biography
Thomas met An An and Yin-Long during his visit to China. The coaches usually work with Hong-Mei and Thomas during his Chinese passenger runs. Occasionally, Yong Bao pulls them.

An An and Yin-Long once told Thomas about pandas in China and how they are hard to find in the wild. They also told Thomas about the many uses of bamboo and the importance of a water wheel.

Personalities
An An and Yin-Long are both cheerful and bring out an engines' friendliness, and due to working all around China, they have extensive knowledge of the country's routes.

Basis
Although An An and Yin-Long are Chinese coaches, they are actually based on British LB&SCR Stroudley coaches, designed by William Stroudley and built at Brighton Works between the early 1870s and late 1880s. Several coaches of this type are preserved on the Bluebell Railway and the Isle of Wight Steam Railway.

Annie and Clarabel are also based on these coaches along with several orange branch line coaches.

Livery
An An and Yin-Long are painted bright mint with lime green wheels and dark grey rooftops. Underneath their windows, they both have four lime green stripes with three lime green symbols painted in the middle of them. These three symbols are the Shou, a word that means "longevity".

Appearances
Television Series= {{Scroll box|

Thomas & Friends

 * Series 22 - Number One Engine, Thomas in the Wild, The Water Wheel and Thomas and the Dragon
 * Series 23 - Wish You Were Here

Music Videos

 * Series 22 - The Journey Never Ends, All the Girls Around the World and Let's Dream
 * Series 24 - New Year's Day with Thomas

Videos
}}
 * 2018 - Meet Hong-Mei of China!
 * -|Other Media=

Annual Stories

 * 2019 - Thomas and the Dragon
 * 2020 - Thomas in the Wild

Books

 * 2021 - Friends Around the World

Voice Actors
An An:
 * Siu-see Hung
 * Erina Yamazaki
 * Franciska Friede
 * Amanda Hinojosa
 * Hanna Mönkäre
 * Gabriela Milani
 * Olga Kuznetsova

Yin-Long:
 * Windson Liong
 * Kunihiro Kawamoto
 * Oliver Hermann
 * Francisco Klee
 * Tuukka Leppänen
 * Ricardo Fábio
 * Daniil Eldarov
 * Miguel Ángel Poison

Trivia

 * Yin-Long's name means "silver dragon" in Mandarin.
 * Some promotional articles for the twenty second series refer to Yin-Long as ZiLong while the 2019 annual refers to him as Lin Yong. The 2020 annual also referred to him as Yin-Lang at one point.
 * An An and Yin-Long's models are both modified versions of Annie's, as both of them lack a guard's compartment.
 * An An and Yin-Long have undergone some aesthetic changes throughout the series:
 * Series 23:
 * Their faces are reduced in size.