Closed rail bridge Very often, the cue ball comes close to the rail, so we can not make any bridge from the playing surface; we have to make rail bridges. Rail bridges can be divided into open and closed, but all of them use the term "rail" in their name and in their structure. In this article, we shall explain the closed rail bridge. It is the best rail bridge and one of the most powerful bridges in pool. 1st step:  Put your palm on the rail and spread your fingers with yo