Howard Street Tunnel

The Baltimore Belt Line was constructed in Baltimore, Maryland, by the Baltimore and Ohio Railroad (B&O) in the early 1890s to connect the railroad to its new line to Philadelphia and Jersey City (the terminal serving New York City). It included the Howard Street Tunnel, the Mount Royal Station for B&O's Royal Blue Line passenger trains, and the first mainline railroad electrification in the United States. Today, CSX Transportation operates the line as part of its Baltimore Terminal Subdivision.

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Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

Other tunnels in United States

Delaware Aqueduct United States · 137 km Päijänne Water Tunnel Finland · 120 km Orange–Fish River Tunnel South Africa · 82.8 km Ishikawa Tunnel Japan · 78.5 km Brenner Base Tunnel Austria · 64 km Mont d'Ambin base tunnel France · 57.5 km Gotthard Base Tunnel Switzerland · 57.09 km Hong Kong–Zhuhai–Macau Bridge China · 55 km