OUDOM XAI, Laos — Wang Quan, the new Chinese owner of a hotel in this farm town tucked into the tropical mountains of northern Laos, is hoping that the first of 20,000 Chinese workers will arrive here soon to start construction on a new railroad.

The Chinese-financed railway is to snake its way through dozens of tunnels and bridges, eventually linking southern China to Bangkok, the capital of Thailand, and then on to the Bay of Bengal in Myanmar, significantly expanding China’s already enormous trade with Southeast Asia.

But Mr. Wang may have to wait a little longer to make his fortune from all the Chinese expected to descend on this obscure corner of Laos about 50 miles from the nearest border with China. Even though the project has run into some serious objections from international development organizations, most experts expect it to go ahead anyway. That is because China considers it vital to its strategy of pulling Southeast Asia closely into its orbit and providing Beijing with another route to transport oil from the Middle East.

The crucial connection would run through Oudom Xai between Kunming, the capital of China’s southern province of Yunnan, and the Laotian capital, Vientiane.