The MTR Corporation has sold HK$18.8 billion (US$2.4 billion) in green bonds, the largest and the company’s first public bond issuance in the Hong Kong dollar market, in its latest efforts to diversify funding sources for a string of projects. The rail giant said on Wednesday that it sold five-year, 10-year and 30-year bonds, with the size of each tranche also representing the largest for their respective tenors to date.