rails to trails is exactly what they did for the chesco trail, people still cried
Around here, they b*tched about the "crime corridor" and safety, because it is a direct path from the "inner city" to the "safe suburbs". As if there aren't any criminals in the suburbs. Gotta hate those shopping cart people. Ax murderers, the lot of them, I say.
We have a developing network of rail trails out here, being built section by section and connecting them when each section is ready. Some of these paths are stunningly beautiful. The oldest one, the one I commute on when I can commute, needs a complete rebuilding. It's too narrow, and the trees are so close to the edge that they roots have buckled the surface to the point where it's like riding off road.
The local large towns and cities have bike lanes on the major routes. They are often populated by double parkers, delivery trucks, people standing around, etc., so one has to be diligent.