Samuel Garcia Sepulveda, the governor of Mexico's Nuevo Leon state, onboard the Metrorrey light rail vehicle for its test run on May 31. [Photo provided to chinadaily.com.cn]

Samuel Garcia Sepulveda, the governor of Mexico's Nuevo Leon state, onboard the Metrorrey light rail vehicle for its test run on May 31. [Photo provided to chinadaily.com.cn]

By LI MUYUN and ZHU YOUFANG in Changsha |