First announced last week, the 1,800-kilometer line would link Tibet's capital, Lhasa, with the western Chinese metropolis of Chengdu with an estimated travel time of 13 hours.
Losang Jamcan, the governor of the Chinese-ruled territory, said during a meeting of Tibetan delegates to China's National People's Congress that Tibet's regional government considers the project important to improving living standards.
The second railway would complement a 1,956-kilometer line that opened in 2006 and crosses passes as high as 5,000 meters.
The train has brought a major increase in both tourism and trade. With a population of just 3.2 million, 91 per cent of whom, China says, are Tibetan or members of other minority ethnic groups, Tibet last year recorded visits from 20 million tourists, a 29 per cent rise from the previous year.
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"It seems that every time we build a railway or something, there are worries about the environment and such. Rest assured, Tibet's environment is well protected," Padma said.
Along with facilitating trade and tourism, the existing railway to Tibet has cemented Chinese control over the territory, which was occupied by Communist forces in 1950.
China claims Tibet has been part of its territory since the mid-13th century, although many Tibetans say they were effectively independent for most of their history, and that the Chinese government wants to exploit their resource-rich region while crushing their cultural identity.