Workers generally advance from helper positions to become assistant signal mechanics, and from there to positions as signal maintainers. Other advanced positions include signal shop foremen and signal inspectors. These promotions, which are related to workers' seniority, sometimes take a number of years to achieve. Experienced signal mechanics can advance to such supervisory positions as gang foremen, directing and coordinating the activities of other signal mechanics. At one railroad, Norfolk Southern, signal mechanics are designated as assistant signal persons after qualifying as trainees. After completing two phases of training and based on seniority, assistant signal persons can bid for promotion to a signal maintainer position with territorial maintenance responsibilities.
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