208086
Their works at Coalbrookdale in Shropshire nurtured the start of improvements in metallurgy that allowed large-scale production of the iron that made the development of the steam engine and railway s possible , although their most famous innovation was the Ironbridge .
 Coalbrookdale
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Coalbrookdale