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 [quote user="locobasede"] Good morning, Boyd, and everyone else: I am the compiler of the data to which you referred in your post.  It is extracted from a larger database that covers as many of the world's locomotives as there is data available.   Wes Barris has been kind enough to host my data for several years. In addition to devising the process through which we could post as much data per locomotive as we do, Wes flags the obvious inaccuracies and passes along comments from visitors.   Please also note that he offers his own commentary about many of the arrangements and classes on the home pages for each of those sections.  During all of the time Wes has hosted the data, he has displayed my name and my email address.  Several visitors to that site have contacted me through the email address with corrections, comments, questions, and points of discussion.  Any of those contacts would tell you if asked that I respond positively, accept the comments willingly, and incorporate them readily.   A review of the commentary on most of the entries will show the primary source's full bibliographic cite.  In addition, I will include the identity of the person who contacted me with a correction and usually will quote him or her verbatim.  In short, my door is always open and that stance does not reflect a recent change in policy.To respond to your specific inquiry about minimum rail weight.  That's an actual calculation I unearthed in the Chicago & Eastern Illinois' Data on Locomotive Equipment book dated October 1, 1912.   It is admittedly a simplistic calculation: Weight of drivers/number of drivers, which is divided by 3000. That result is multiplied by 10.Their example is 103,000 weight on the drivers/4 drivers = 27,750.27,750/3,000 = 8.58.8.58 x 10 = 85.8, which the Data Book describes as weight permissible per weight of rail.  That's it.  It's obviously a debatable formula, but my point is that it came from a book used by an operator in real-time railroading.  I cannot tell you that those assigning the locomotives in fact believed that this was the only number they need; like you, Boyd, I doubt it. For one thing, the constant used in the calculation (3,000) undoubtedly changed at some point after 1912, or should have.  But like most of the rest of the data I've included, it's sourced and the sources typically represent my attempt to convey what operators or knowledgeable commentators knew (or thought they knew) at the time this particular class was in service. (I'll admit to exceptions to that claim and offer no excuses other than lack of editorial resources.)  As far as the minimum rail weight given for the C & O Allegheny.  Doesn't the figure (141 lb/yard) underscore the weight problem that's been discussed when we take into account your comments about the actual weight/yard used at the time?  Again, I welcome any comments about any of the entries.  All of the designs that have been discussed in this thread have data and commentary available at steamlocomotive.com. Steve LlansoLocobasedelocobase@comcast.net [/quote] Thank you Steve, for reply. Now, were those figures updated? Or where they specific to their own RR's?
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