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The Clinton-Oklahoma-Western Railroad Company of Texas was a 56-mile length of railroad track extending from the Oklahoma state line in eastern Hemphill County , Texas , to Pampa , the county seat of Gray County , located northeast of Amarillo .
 Oklahoma, Hemphill County, Texas, Pampa, Gray County, Amarillo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oklahoma, Hemphill County, Texas, Pampa, Gray County, Amarillo