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The southern end of the 2.5 km long branch line left the Cornish Main Line ( ex - Cornwall Railway ) at Trenance Junction which lies 500 metres west of St Austell railway station .
 branch, Cornwall Railway, Austell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 branch, Cornwall Railway, Austell