Baltimore and Ohio Railroad Opens First Section

On May 21, 1830, the Baltimore and Ohio Railroad began regular passenger service over its first completed segment, using horse-drawn cars on iron rails. This pioneering effort overcame significant engineering challenges, including the construction of the Carrollton Viaduct, the first stone railroad bridge in America. Key figures included Philip Thomas and George Brown, who championed the project amid competition from canals. The B&O's innovation laid the groundwork for America's vast rail network, connecting ports to inland markets and spurring industrial growth. Its early use of steam locomotives like the Tom Thumb in trials demonstrated the superiority of mechanical power over animal traction, influencing future designs and establishing standards for track gauge and signaling that persisted for decades.