A rail is an investors guide to seeing how a horse is doing, what the current bankroll status is, and for any future investors to see how a horse works with investors.
It is important to Keep a legible rail. Rails should be updated frequently and at minimum daily with games played and running bankroll status. Any tough spots or hand histories or bad beats to show investors variance should be included as well. Other members often search rails and see how well horses are playing, or if they want to see if the horse is worth future investments.
Remember, its not just important for your current stake, but future ones as well. So keep a good clean rail that is updated daily!