Ключевые слова: abstraction, background image, blue, center, confusion, connection, course, electric, electricity, electro, emblem, empty, energy, equip, equipment, metallic, network, nobody, overhead, pantograph, rope, sign, silhouette, sky, spinning top, steel, stoned, street, stretching, stroke, support, technology, telephone communication, track, train, transfer, transportation, travel, trolley bus, trolleybus, urban, voltage, wire,