Which of the following groups of workers is NOT typically covered by the Social Security program?

Railroad workers are not covered by the Social Security program because they are typically covered under a separate system known as the Railroad Retirement System. This system operates similarly to Social Security but is specifically designed for those working in the railroad industry, providing benefits that account for the unique needs and circumstances of railroad employment.

Federal employees, private sector employees, and self-employed individuals, on the other hand, generally participate in the Social Security program, contributing through payroll taxes and receiving benefits upon retirement, disability, or death. The distinct nature of the Railroad Retirement System is a key reason why railroad workers do not fall under the standard Social Security coverage, emphasizing the specialized benefits available to them through their specific employment sector.