A Brazilian judge has accepted charges filed by state prosecutors against 11 companies for allegedly forming a cartel to raise prices on the construction and upkeep of subway and train systems in the state of Sao Paulo.

A press officer of the prosecutor's office said Saturday that Judge Marcos Pimentel Tamassia accepted the charges that involve contracts signed between 2000 and 2007. She spoke on condition of anonymity because she was not authorized to comment the case.

Among the companies being charged are Germany's Siemens, CAF of Spain, Mitsui of Japan, Bombardier of Canada and Alstom of France.

None of the companies were available for comment on Saturday