|  A1 | (Boxcar) Sliding Door, Less than 9 Ft. | 
|  A2 | (Boxcar) Sliding Door, Equal to 9 Ft. or Less than 11 Ft. | 
|  A3 | (Boxcar) Sliding Door, Equal to or Greater than 11 Ft. | 
|  A4 | (Boxcar) Plug Door Less than 9 Ft. | 
|  A5 | (Boxcar) Plug Door Equal to 9 Ft. or Less than 11 Ft. | 
|  A6 | (Boxcar) Plug Door Equal to 11 Ft. or Over 11 Ft. | 
|  A7 | (Boxcar) Sliding and Plug | 
|  AO | (Boxcar) Any Other Type Door | 
|  B1 | (Unequipped Boxcar) Door Less than 8 Ft. | 
|  B2 | (Unequipped Boxcar) Door Equal to 8 Ft. and Less than 9 Ft. | 
|  B3 | (Unequipped Boxcar) Door Equal to 9 Ft. and Less than 10 Ft. | 
|  B4 | (Unequipped Boxcar) Door Equal to 10 Ft. and Less than 11 Ft. | 
|  B5 | (Unequipped Boxcar) Door Equal to 11 Ft. and Less than 13 Ft. | 
|  B6 | (Unequipped Boxcar) Door Equal to 13 Ft. and Less than 15 Ft. | 
|  B7 | (Unequipped Boxcar) Door Equal to 1 Square Foot and Greater | 
|  BO | (Unequipped Boxcar) Door Any Other Door Type |