Re: Dimensional Data - wrong assumptions

Dave Parker


The car lettering diagrams in the CBCs are not always up to date. For example, the diagram accompanying the "1920 Revision" that appears in the 1922 CBC dos not show the journal repack stencil that was adopted in 1920.

The absence of the  EXW and EXH stencils in the 1931 CBC is another example.  But, these stencils were proposed (pp. 616-620) and approved (p. 1020) in the 1929 ARA Proceedings.  Effective date to be March 1, 1930. 

The CBCs were effectively trade catalogs, and should be considered a secondary source for MCB/ARA/AAR standards or rules.
Dave Parker
Swall Meadows, CA

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