noun
or distant block signal
: a railroad signal placed at a distance that will allow adequate advance warning of the setting of a home signal at which the train must stop — called also approach signal
noun
or distant block signal
: a railroad signal placed at a distance that will allow adequate advance warning of the setting of a home signal at which the train must stop — called also approach signal
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012