Re: Freight car Distribution (off list)
Tim: I have, with a lot of help from Allen Rueter, Matt Herson, and others, built a NP database for 1969 that's whopping big now (and growing)---13419 freight car records, ca. 150 trains spread throughout 1969. Obviously it's post-steam era but certainly can help inform G-N and alternative hypotheses.toggle quoted messageShow quoted text
There are some obviously skewed deviations from G-N predictions in NP traffic flow, but they're all explainable based on recognized exceptions or geography. In a nutshell I'd say from the NP's point of view, there is the CBQ (way overrepresented), the GN (way underrepresented), and all others (conform more or less roughly to G-N proportions). Some other car types, in particular reefers, are very severely skewed away from national fleet proportions. The upshot is that G-N strictly pertains to such a small subset of the overall freight car fleet that Like Al Brown, I question if it's worth all this energetic argument.
I wonder why Mike A. would use the Monon train records to validate the rarified G-N hypothesis and buy a fleet accordingly, when the has in his hands a direct empirical template for the fleet he could be aiming for--with all the assigned-service, traffic routing and car-pooling agreements and multiple other local particularities built in. I use my data more like Clark Probst does. If a certain car series shows up in the database--especially multiple times--it gets priority for modeling. If a car doesn't show up in the data, it requires a fairly well-reasoned stretch (or photo evidence) to rationalize including it in my model fleet.
--- In STMFC@yahoogroups.com, Tim O'Connor <timboconnor@...> wrote: