China's two largest trainmakers, CSR Corp and CNR Corp, inched one step closer to their impending merger after getting necessary approvals from overseas antitrust authorities, according to company announcements on Wednesday.

The merger has gained approval from antitrust regulators in Australia, Germany, Pakistan and Singapore, without any additional items or obligations, or remedies, CSR said in an announcement.

The company, however, said it still needs to get the green light from the China Securities Regulatory Commission, the Ministry of Commerce and the Hong Kong Exchanges and Clearing Ltd, which runs Hong Kong's stock exchange.