Earlier quoted context omitted.
Are there any concepts where you can pave down the center and on the sides of tracks? To keep the track useful for later use, but to still allow cyclists to use them?
This strikes me as a terrible idea for two reasons. 1. Slim bike tires getting stuck in the grooves left for the train tracks. 2. Big trains with a ton of inertia running at ~50-60 mph using the same route as cyclists going at ~10-20 mph.
Also, I'm not implying using it for high-speed trains and bike trails at the same time. I'm suggesting being able to go back to use of the paths for trains, and not tearing the tracks out.