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The main-line service was revived for a one-off event on 6 May 1994 when it formed part of the celebrations for the inauguration of the Channel Tunnel .
 Channel Tunnel
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:
 Channel Tunnel