Trade unionists are protesting against the privatization of public companies and cuts in education in the budget of the territorial division.
At least nine Metro and CPTM lines should be affected by the strike.
Some state public services will work under the so-called optional point, that is, a day in which work is not mandatory, leaving it to the discretion of the administration or the contractor to decide whether or not to grant days off to their employees.
The measure is not valid for Public Security and Education workers.
The Metro and the CPTM transport nearly 4.2 million passengers daily in Sao Paulo, only taking into account the lines managed by the two state entities, whose operations must be affected by the strike.