China has allocated funds to do preliminary research on building an international railway connecting the westernmost city of Kashgar in the Xinjiang Uygur autonomous region with Pakistan's deep-sea Gwadar Port on the Arabian Sea, according to the director of Xinjiang's regional development and reform commission.

"The 1,800-kilometer China-Pakistan railway is planned to also pass through Pakistan's capital of Islamabad and Karachi," Zhang Chunlin said as the two-day International Seminar on the Silk Road Economic Belt commenced on Thursday in Urumqi, Xinjiang's capital.

"Although the cost of constructing the railway is expected to be high due to the hostile environment and complicated geographic conditions, the study of the project has already started," Zhang said.