Lao trainees visit the CREC-2 rail-welding yard in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)

Lao trainees take a group photo with Chinese engineers after visiting the CREC-2 rail-welding yard in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)

A Chinese engineer briefs Lao trainees in the CREC-2 rail-welding yard in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)

Lao trainees visit the CREC-2 rail-welding yard in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)

Lao trainees take a ride on the engineering train of the CREC-2 rail-welding yard in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)

A train driver of the CREC-2 rail-welding yard introduces the engineering train to the Lao trainees in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)

Lao trainees watch the engineering train of the CREC-2 rail-welding yard in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)

Lao trainees take a ride on the engineering train of the CREC-2 rail-welding yard in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)

Lao trainees visit the CREC-2 rail-welding yard in Vientiane, Laos, Sept. 11, 2020. Some 70 Lao trainees to join the China-Laos railway's future operation visited the China Railway No.2 Engineering Group (CREC-2) rail-welding yard in the Lao capital Vientiane on Friday. The Lao trainees also took a ride on the engineering train running on the ready railway section near Lao capital. (Photo by Kaikeo Saiyasane/Xinhua)