Ключевые слова: america, american, authority, bay, boston, cartography, city, commute, commuter, extension, geography, graphic, green, house, illustration, line, ma, map, massachusetts, mbta, medford, metro, new, platform, rail, railroad, railway, schematic, sign, somerville, square, states, station, subway, symbol, tour, tourism, train, transit, transport, transportation, travel, trip, tufts, union, united, university, urban, usa,