White bar next to the cone symbol in training section?

Sometimes it's full, sometimes it's empty. What is it?
It shows you how close you are to earning your next training point for that player
Thanks!
Is there a formula for calculating training effect?
I'm sure there is in the program but in general it is the training rate of the individual x training rate of facility ÷ star level of player. The higher the training rates the faster they train and the higher the star rating the slower they train