Middlesex was the General Contractor for the rehabilitation and expansion of two Amtrak stations, 16 bridges, and approximately 19 miles of new track rail between Rensselaer and Schenectady, New York. Many complexities existed within this project including the continuous operation of Amtrak throughout the duration of the project.

A new 1-mile-long fourth track was added to the Rensselaer Station, increasing its capacity by 33%. Along with the fourth track, approximately one mile of new storage tracks and approach track was constructed. A 17-mile second track was installed from the Hudson River through the Schenectady Station to the Mohawk River.

In addition, 16 bridges, as well as one tunnel and several large culverts, were refurbished and retrofitted to accept both the fourth track and the second track additions to the Amtrak system.