51215
The station had two opposing platforms on the GNR 's lower level tracks and an island platform with two faces on the LD&ECR 's tracks immediately above , the two levels were connected by stairs .
 GNR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 GNR