122906
Although examples were built as early as 1852 – 53 by two Philadelphia manufacturers , Baldwin Locomotive Works and Norris Locomotive Works , these first examples had their leading axles mounted directly and rigidly on the frame of the locomotive rather than on a separate truck or bogie .
 Philadelphia, Baldwin Locomotive Works, Norris Locomotive Works
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:
 Philadelphia, Baldwin Locomotive Works, Norris Locomotive Works