Line controllers are responsible for running the network - used by more than three million passengers a day. Their skilled and stressful job combines control of both the signals and train operation. They have a wide variety of pay and working conditions and LU wants to standardise them.Mr Law, a former Tube driver, said; "We have had four years of negotiations. Now LU wants to cut 76 jobs and lengthen shifts to 12 hours." He said although LU had put some more money on the table most of this would go to managers rather than signalling staff.