It is looking for the best practices and innovative approaches to deliver the Maryland Purple Line and the Baltimore Red Line.
The RFI was issued within days of Maryland’s new public-private partnership (PPP) legislation being signed into law by governor Martin O’Malley.
The cost estimate for two light rail lines is US$2.5bn (£1.6bn) for the 16-mile Purple Line and US$1.8bn (£1.2bn) for the 14-mile Red Line.
The new law and the passage of the 2013 Transportation Infrastructure Investment Act will generate US$4.4bn for transportation in the first six years alone, said O’Malley.
Construction is planned to start in 2015 with the goal of having the light rail lines completed and in service after 2020.