| MA | Postal Car constructed and equipped for passenger train
service, with side doors, with or without mail-bag hook
and suitable fittings for sorting and classifying mail
in transit, with or without end doors and windows.
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| MB | Baggage & Mail Car constructed and equipped for passenger train
service, with side doors, with or without mail-bag hook
and suitable fittings for sorting and classifying mail
in transit, with or without end doors and windows.
Having two compartments separated by a bulkhead
and having suitable side doors.
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| MR | Mail storage Car constructed and equipped for passenger train
service, suitable for carrying mail in bulk, and without
suitable fittings for sorting and classifying mail
in transit, with or without end doors and windows.
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