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Notes
 
  
Freight cars in NP service during the years before 1910 as shown in the ORERs of the time.
 
  
Freight cars in NP service in the 1930 era as shown in the ORERs of the time.
 
  
Freight cars in NP service during the years before 1940 as shown in the ORERs of the time.
 
  
Refrigerators cars in NP service in the 1940 era as shown in the ORERs of the time.
 
  
Freight cars in NP service during the years before 1950 as shown in the ORERs of the time.
 
  
Refrigerators cars in NP service in the 1950 era as shown in the ORERs of the time.
 
  
Freight cars in NP service during the years before 1960 as shown in the ORERs of the time.
 
  
Refrigerators cars in NP service in the 1960 era as shown in the ORERs of the time.
 
  
Freight cars in NP service during the years before 1970 as shown in the ORERs of the time.
 
  
Refrigerators cars in NP service in the 1970 era as shown in the ORERs of the time.