 In December 2006, the Alameda Corridor Transit Authority (ACTA) presented a feasibility study to analyze alternatives and costs for design and construction of an east-west structure, which would grade separate the BNSF and UP main line tracks at Colton Crossing.In addition, ACTA prepared a report on a proposed north-south flyover to the south of Colton Crossing to reduce train crossing conflicts and hours-long congestion.The report was evaluated by ACTA, UP, BNSF and the San Bernardino Associated Governments (SANBAG).