What is Highballin?

High ball is an old time reference to a signal used to tell train crews it was ok to leave and the track was clear ahead.There was a pole with a ball and when the ball was raised to the top it was called a high ball and the train would leave.We still use the term but the pole and ball are now part of railroad history.Now it's used to tell a train everything is ok and go on at full speed ahead. 

Highballin'