ReferenceUSA, a database of 14 million private and public companies in the United States, searchable by corporate name, location, and industry. Entries provide links to parents and subsidiaries. (Rutgers-restricted Access) (Non-Rutgers users who are New Jersey residents can use ReferenceUSA via Jersey Clicks with a public library card.)
Other online directories that cover the transportation sector include:
The major freight movers and shipping firms are useful sources of information.
There are a couple of White Papers available from CSX Transportation Intermodal.
The Hub Group offers a way to Explore Shipping Routes within the United States by comparing shipments by road (or truck) or primarily by rail (or intermodal).
You can also consider the many indicators of economic activity in the Transportation & Travel sector, including cargo and freight shipments by truck, rail, air, and sea.
Several logistics firms and organizations offer white papers on different aspects of operations along the supply chain, including data communication, warehousing, distribution, packaging, and fulfillment:
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