What series of numbers make up the M-3 and M-7 fleet of cars?

The series of numbers identifying the M-3 and M-7 fleet of cars is specifically designed to categorize and manage different models within the Long Island Rail Road (LIRR) system. The M-7 cars are numbered starting from 7001 and continue upwards, while the M-3 cars are designated by the numbers ranging from 9771 to 9944.

Understanding this numbering is important for conducting maintenance and operations, as it helps railroad employees distinguish between different car types that may have different specifications, maintenance requirements, and operational protocols. By establishing a clear and systematic numbering convention, it simplifies the process of identifying and managing the fleets, ensuring efficiency and safety in operations.

The other options do not align with the actual numbering system used by the LIRR for the M-3 and M-7 fleets, highlighting the unique designations that contribute to effective fleet management.