outdoors 12,410, background 11,166, outside 10,271, multiple characters 9,724, riding 8,571, tree 8,197, sky 8,002, plant 5,916, clouds 4,378, trees 4,031, vehicle 3,834, window 3,376, cloud 2,563, train 1,930, plants 1,795, lights 1,781, electric 1,424, windows 1,095, country 521, travel 485, windshield 423, wheels 277, traveling 230, railroad 188, countryside 184, doors 108, transportation 97, rail 95, electric power 94, steps 75, headlights 53, windshield wipers 47, electric train 46, electric wire 46, electric locomotive 41, trolley 27, trolley car 18, train ride 17, passengers 17, train trip 9

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