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The first 106 locomotives were built up to World War I , and had right-hand drive ; construction resumed in 1920 , and the remaining 165 were all built , up to 1928 , with left-hand drive and a slightly longer boiler .
 World War I
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 World War I