The battle to win the two to three bookrunners slots for a roughly HK$15 billion ($1.9 billion) secondary offering of shares in the government-controlled train operator is shaping up to be one of the most competitively fought mandates of the year. On offer is the position of government adviser, for which BNP Paribas Peregrine and ING Barings have been shortlisted and global coordinator, for which nine other banks are in the running.