Home Railway Tracks Laid Through Tunnel in First for Laos-China Railway Track Laid in Tunnel along Laos-China Railway for First Time (Photo: http://www.news.cn/)

Track Laid in Tunnel along Laos-China Railway for First Time (Photo: http://www.news.cn/)

Track Laid in Tunnel along Laos-China Railway for First Time (Photo: http://www.news.cn/)

Track Laid in Tunnel along Laos-China Railway for First Time (Photo: http://www.news.cn/)