[2] Additionally, a southern LPA was recommended to connect downtown St. Louis with Cross County Segment 2 via Union Pacific Railroad right-of-way and a new busway between Chouteau and Loughborough avenues.

[4] In 2017, St. Louis City voters passed Proposition 1, a half-cent sales tax estimated to generate about $12 million per year for MetroLink expansion.

[7] In September 2023, Bi-State's board approved a 4-year, $18.9 million contract with the joint venture Northside-Southside Transit Partners to provide consulting services for the design phase of the project.

[8] In February 2024, the East-West Gateway Council of Governments approved the updated locally preferred alternative along Jefferson thereby allowing the region to apply for federal funding.

[9] Metro will expand the Ewing Yard and Shops to maintain light rail vehicles for the proposed expansion.

[12][13] The 5.8-mile (9.3 km) route would begin at the intersection of Natural Bridge Avenue and Grand Boulevard with a station at Fairground Park.

Downtown stations include Market Street and Scott Avenue/Ewing Yard where a transfer between the Red and Blue lines can be made.