A tender is underway to provide new rolling stock to the region's rail services, while other works include converting a section of the Biotrén network into an underground line and replacing a bridge.
Two groups filed lawsuits to challenge the awarding of contracts related to the construction of the airport.
The Brazilian firm was seeking US$60mn due to the cancellation of a gas pipeline expansion contract.
The state government is providing some US$22mn for infrastructure and sanitation projects in 38 municipalities.
Singapore sovereign wealth funds have emerged as potential buyers.
The court of accounts detects 51 irregularities in the process.