Passengers are typically transported by which of the following railroads as the first in the U.S.?

The Baltimore and Ohio Railroad (B&O) holds historical significance as one of the first railroads in the United States to provide passenger services. Established in 1827, it marked an important milestone in the development of the American rail network, showcasing the potential of rail transport to connect cities and facilitate commerce and travel.

The B&O was pivotal in shaping the early railroad industry, being the first to offer scheduled passenger service in the U.S. in 1829. This was a significant innovation at the time, as prior modes of transport were slower and less efficient. The B&O also contributed to the expansion of rail travel, influencing the widespread adoption of railroads throughout the country, ultimately leading to the extensive rail network seen today.

While the other railroads mentioned in the options each played vital roles in the growth of the U.S. rail industry at various points, they came into prominence or started operations after the B&O established its passenger service. This timeline solidifies the B&O's position as a pioneer in American railroad history.