The Railroad Signal Specialist Passbook® prepares you for your test by allowing you to take practice exams in the subjects you need to study. It provides hundreds of questions and answers in the areas that will likely be covered on your upcoming exam, including but not limited to: ability to supervise a group of technical employees; technical knowledge of the design and installation of railroad signal systems; knowledge of safe working procedures related to signals; and more. | Railroad Signal Specialist (c-663) by National Learning Corporation, Paperback | Indigo Chapters