Why Modern Trains Lack Traditional Signal Lights

Why modern trains lack traditional signal lights

White classification lights above the number boards indicate this Canadian Pacific freight is an extra — a train not listed in the timetable. The center of each three-lamp set of class lights is green; the innermost lights are red. Most modern diesels lack traditional signal lights. Carl Swanson photo Soon after the first railroad bought the second locomotive it became apparent that some rules of the road were needed. There had to be a way to ke…