When I transferred into the signal dept,Penn Central was still the operator so my memory may have lapses.As a trainee,you are to get acclimated to the safety rules,signal rules,rules of the operating department,track structure,work with experienced signal department personnel to learn how the signals & switches operate,how to maintain and trouble shoot switch & signal failures,change gears in a switch machine,adjust the switch rods so the switch points are tight on the stock rails,read schematics. Monthly,ICC switch tests are performed to see that the switches close properly. Generally speaking,you are to learn the practices of the signal department. Good luck in your endeavor.