My Red Caboose (ASCII artwork) notes RC-7000,7001,7002,7003,7005.
The artwork was originally created by Chris Barkan.

 RC-7003

        ARA boxcar 1923 body style (style 1)
        w/ appropriate details for B&O M26A etc
        w/ shorter wheelbase than X-29 (approx 12" shorter)
        ___       ___        ___       ____      ____
            : |.       : |.       : |.      : |.      |
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            : |.       : |.       : |.      : |.      |
        ___ : |.  ___  : |.  ___  : |. ____ : |. ____ |


 RC-7002

        X29 boxcar 1924 body style (style 2)
        w/ long wheelbase and steel plate ends
        This style is correct for B&O M-26B and NKP ex-W&LE cars
        ___       ___        ____        ____      ____
            : |.       : |.        : |.       .: |      |
            : |.       : |.        : |.       .: |      |  
            : |.       : |.        : |.       .: |      |
        ___ : |.  ___  : |.  ___   : |.  ____ .: | ____ |


 RC-7005 -- same as 7002 but has patch panel side reinforcements


 RC-7000

        X29 boxcar 1928-1929 body style (style 3)
        w/ long wheelbase
        ___      _____      ____     _____   _____
            | :.       | :.      | :.    .: |      |
            | :.       | :.      | :.    .: |      | 
            | :.       | :.      | :.    .: |      |
        ___ | :  _____ | :  ____ |   ____   | ____ |


 RC-7001 -- same as 7000 but with dreadnaught ends

Tim O'Connor