Sustain Charlotte's letter to CATS on the silver line was referenced in the latest WFAE story about the 2030 System Plan.
"A citizen group, Sustain Charlotte, had called on CATS not to abandon the tunnel entirely, but instead to proceed with engineering studies. The group says the new alignment through the northern end of uptown would limit pedestrian access to uptown and could lead to lower ridership than a tunnel. "Further analysis would help to clarify some of the 'unknowns,' including the complexities of the tunnel option," the group said in a letter to CATS."
Full story here.