The news came as 500 senior party members held a four-day closed-door meeting that ended on Sunday to finalise leadership decisions ahead of a ten-yearly power handover this month.

The Central Committee "endorsed a decision made by the Political Bureau... to expel former Railways Minister Liu Zhijun", Xinhua state news agency reported, referring to the party's top decision-making body.

The committee also expelled disgraced politician Bo Xilai over corruption charges, named two new military vice-chairmen and approved a draft amendment to the party constitution, without providing specifics.

Party authorities had announced they planned to oust Liu in May and hand his case to the judiciary. Expulsion from the party typically comes before a court trial.

State media said previously that Liu, who was appointed in 2003 and sacked last year, faced investigation for allegedly taking payouts while handing out contracts for the rapid expansion of China's high-speed railway system.

The network, the largest in the world, has been plagued by graft and safety scandals.

The state auditor said last year that construction companies and individuals have siphoned off 187 million yuan in funds for the construction of the flagship high-speed railway line between Beijing and Shanghai.

A crash near the eastern city of Wenzhou in July last year that killed 40 people making it China's worst rail accident since 2008 sparked broad concern about the safety of the ambitious high-speed rail system.