Ключевые слова: ban, black, central, circular, city, communication, commuter, depot, electric, electrical, gray, highlight, hybrid, indicating, industry, infrastructure, line, logistics, machine, mean, metal, metro, modern, movement, operational, platform, prohibiting, public, railroad, railway, red, road sign, route, russia, saintpetersburg, semaphore, service, shines, signal, sky, st petersburg, station, subway, technical, traffic, transport, transportation, travel, wires,