I always figured the song "Promised Land" made more than passing reference to the civil rights struggle. Here's a great article quoting Howard DeWitt and making the same case. Remember that the Greyhound bypasses Rock Hill. Here's a bit of history I didn't know (but that Chuck knew) about the first Freedom Ride.
In 1961 a group of seven black and six white people, including John Lewis, left Washington, D.C. for New Orleans on two buses, a Trailways bus and a Greyhound bus. The group made it through Virginia and North Carolina without incident.
At the Greyhound bus station in Rock Hill, South Carolina, the group encountered violence. A mob of twenty attacked the group, and John Lewis was the first to be hit as he approached the white waiting room.