Another senior Chinese official is under investigation in the latest case targeting corruption in the rail system.

News reports said Friday that authorities detained Su Shunhu, deputy director of the Transport Bureau of the Ministry of Railways last month.

The bureau is responsible for railway construction plans and coordinating rail traffic.

The reports said Su received a property in Beijing in exchange for helping a coal mine owner solve his rail cargo problems.

Su is the third senior railway official this year to be accused of corruption.

Railway minister Liu Zhijun was fired in February, amid allegations of graft linked to rapid expansion of the nation's rail network.

In March, Zhang Shuguang, the ministry's deputy chief engineer, was suspended from his post amid corruption reports.