Ключевые слова: background, connector, destination, direction, distance, endless, engineering, express, francisco, industrial, iron, journey, landscape, line, lines, lock, locomotive, long, metal, nature, parallel, perspective, rail, railroad, railway, river, road, rock, route, sand, sign, signal, sky, spike, steel, stone, straight, structure, switch, tie, tourism, trace, track, traffic, train, transit, transport, transportation, travel, trip, wood,