Task: Text Categorization
Input (English): Context: The British Rail Class 144 Pacer diesel multiple units (DMUs) were built by BREL Derby from 1986 to 1987. A total of 23 units were built replacing many of the earlier first-generation Heritage DMUs.[citation needed]Under the Disability Discrimination Act 1995 all public transport will need to be accessible by 2019.
Question: The document can be classified to which topic? 
Options: 1)WrittenWork, 2)EducationalInstitution, 3)Athlete, 4)MeanOfTransportation, 5)Animal
Output (English): 4