To publish this blog I access a number of sources. The following are my most commonly accessed information sources Trains Magazine Progressive Railroading The Surface Transportation Board Seeking Alpha Google News Solutionary Rail Friends and allies https://en.wikipedia.org/wiki/List_of_Class_I_railroads https://en.wikipedia.org/wiki/Railroad_classes https://www.stb.gov/stb/faqs.html# econ How are railroads classified? Answer. Class I railroads are regulated by the STB and subject to the Uniform System of Accounts ( 49 CFR 1201 ). These carriers are also required to file annual and periodic financial and statistical reports. Railroads are classified based on their annual operating revenues. The class to which a carrier belongs is determined in accordance with the following revenue thresholds: Class I - $447,621,226 or more Class II - Less than $447,621,226 but in excess of $35,809,698 Class III - $35,809,698 or less These revenue thresholds are ...