Well, with these replies I was able to refine my search a little more to come up with the transcript from an NPR spot about this. The transcript can be found at http://savvytraveler.publicradio.org...904/bike.shtml. This is about someone in Oregon who is doing this. Their site is http://www.railbike.com/.

Just thought some people might be interested in this as a tour possibility. For more searching try "railbiking" or "bike rail outrigger".

Thanks for helping to jog my memory.