there was extensive discussion on this topic earlier:
http://railroad.net/forums/viewtopic.ph ... 00833b9d72. IMO it is absurd, a way for a few of the suburbs to try and get everyone else to dig them out of the transportation nightmare they've created for themselves by creating all of the sprawl along the 202 corridor with essentially no foresight for a time when it would become completely jammed with cars.
The only useful part of this dream would be in the KoP area and that is exactly where the ROW doesn't exist and would have to be purchased (expensive) and grade separated (expensive) from the mess that exists there now.
The CCM is essentially the Trenton Cut-Off which is owned by a freight railroad (i forget which) and has been single tracked. Most of that ROW is close to, but not in, a destination.
While KOP mall is a fact of life, the buisness park really ought to have never been built and there is no good reason to build a commuter railroad to serve something like that just so that the companies that located themselves out there don't have to pay the price for that stupidity.
Montgomery County needs to get used to the idea that KoP is not nor ever will be the center of the region.