83089
The Pennsylvania Railroad s class A5s was the largest class of 0-4-0 steam locomotive s. History In the 1920s many railroads in the United States of America had retired 0-4-0 steam locomotives , because they were too small to move freight cars in yards and were too small for switching duties .
 Pennsylvania Railroad, United States of America
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pennsylvania Railroad, United States of America