Here's a site on a list I belong to... it shows accident investigations on lots of railroads, and goes back to 1911. There is a wealth of details buried in them, including maps, train lengths, rules, etc.

Here's the link-

http://dotlibrary1.specialcollectio...e=dot_railroads

Click on-

I.C.C. Historical Railroad Investigation Reports (1911-1994)

All download as PDF files.

Enjoy,

-Phil

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Model Railroading means..."A Money-Pit filled with Trains"