Task: Text Categorization
Input (English): Context: The FS E.645 and E.646 are two classes of similar electric locomotives used on Italian railways. They were introduced during the 1950s and they have been retired in 2009.
Question: The document can be classified to which topic? 
Options: 1)WrittenWork, 2)Athlete, 3)Plant, 4)MeanOfTransportation
Output (English): 4