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Abbrevaration used

R Equipment = Railroad Equipment Company

Va/Sharp = 

Pullman = Pullman Standard

Ohio Falls = Ohio Falls Car Company

USRS = United States Rolling Stock Company

St. Charles = St. Charles Car Company

Jackson/Sharp = Jackson and Sharp     

AARR = built by Ann Arbor Railroad Co.

McKeen = Mckeen Motor Cars

b-m-p = baggage/mail/passenger

mail-p  =  mail/passenger

cafe-c = cafe/coach