Train is ready to move, signal is red. "READY TO PROCEED on track XX" Train is ready to move, signal is clear. "PERMISSION TO PROCEED ON CLEAR SIGNAL (# if required) on track XX" ok so in this case if the signal is red your letting the tower know your ready to proceed
if the signal is clear ( no signs) your asking permission to the tower to proceed? and you will let them know the signal # and track# your on?