Railroads are considered a natural monopoly. Because of the extremely high start-up costs, it is not profitable to start a railway if there is already a railway line serving the same route.
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U.S. rail infrastructure is divided between privately owned freight and state-owned passenger rail. Freight rail is an integral part of U.S. supply chains, but the country's passenger service falls far behind that of other advanced economies.
Uber is a commodity or specialty product. They are not a monopoly yet. Lyft is still a popular option. Transportation also has many options like walking, biking, scootering, taking the bus, subways and multitudes of others.
Amtrak, a passenger railroad company, is also considered a Class I. Class Is account for roughly 67 percent of freight rail mileage and 94 percent of revenue.