63-year-old Zhang Jiu'an and his granddaughter play together on the model train he built in his back yard in Sichuan's capital, Chengdu, July 18, 2018. Zhang Jiu'an, a big fan of trains and locomotives, spent five years building his mini-railway in his back yard. The locomotives travel through rivers and mountains, bridges and reservoirs, residential areas and industrial factories. [Photo: IC]

63-year-old Zhang Jiu'an rides on his self-built miniature train in his back yard in Sichuan's capital, Chengdu, July 18, 2018. Zhang Jiu'an, a big fan of trains and locomotives, spent five years building his mini-railway in his back yard. The locomotives travel through rivers and mountains, bridges and reservoirs, residential areas and industrial factories. [Photo: IC]

A locomotive, part of a miniature train 63-year-old Zhang Jiu'an built in his back yard in Sichuan's capital, Chengdu, July 18, 2018. Zhang Jiu'an, a big fan of trains and locomotives, spent five years building his mini-railway in his back yard. The locomotives travel through rivers and mountains, bridges and reservoirs, residential areas and industrial factories. [Photo: IC]

A miniature train built by 63-year-old Zhang Jiu'an is on display in his back yard in Sichuan's capital, Chengdu, July 18, 2018. Zhang Jiu'an, a big fan of trains and locomotives, spent five years building his mini-railway in his back yard. The locomotives travel through rivers and mountains, bridges and reservoirs, residential areas and industrial factories. [Photo: IC]