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The contract ended in mid-2004 , following deliveries of new Class 66 locomotives , meaning that the two electric locomotives were surplus to requirements and they were withdrawn from traffic .
 Class 66
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:
 Class 66