Hong Kong’s MTR Corp is in discussions with banks for several bilateral loans as it continues to expand its railway network in the Asian financial hub, according to people familiar with the matter.

The rail-to-real estate operator has asked banks to commit around HK$1 billion ($128 million) each, with loan tenors of up to five years, said the people, who asked not to be identified discussing private matters. The total cumulative amount to be raised hasn’t been determined yet, the people said, adding that details could change as discussions are ongoing.

MTR “conducts forward-looking financial planning” to address funding needs that arise from business operations, said a company spokesperson, adding that bilateral loans have always served as a tool for its working capital management.

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Substantial funds are required in the years ahead for MTR to maintain and invest in its rail infrastructure. The company is now focused on the next major phase of development, including the extension of the city’s Tung Chung and East Rail lines, among others, according to the company’s website.

MTR is also considering raising funds via bonds, among other options, to help bridge a projected shortfall in its spending needs of at least HK$160 billion over the next decade, Hong Kong-based Ming Pao reported last month, citing an unidentified source.

MTR’s latest discussions with banks are in various stage of advancement, the people said, and follows the rail operator’s signing of a HK$1 billion five-year sustainability-linked revolving loan from. last year. In 2016, the company raised a HK$25 billion syndicated loan from 21 banks.