I would like to be able to either rent track from someone for a specific time period or rent my track to others for a time period.
Renting is straight forward. You pay someone for lengths of track for a specific time period. If selling track you could sell it back to RN for less than you paid for it or find someone else to sell it to for a price you both agree on. Maybe have page where we post our tracks for sale and people bid on them? That way people could get track for less than the going rate.