The letter responds to concerns raised by Friends of Caltrain about the relationship between the California High-Speed Rail project and other local planning efforts like the Caltrain Business Plan and Diridon Integrated Station Concept Plan. It explains that the High-Speed Rail project has been planned collaboratively with Caltrain since 2012 to develop a blended system, and that while the plans will be considered, they will require their own environmental clearances in the future. The letter also states that the High-Speed Rail project will not preclude the other plans from moving forward and that the agencies will continue to work together on long-term plans for the rail corridor.