The IANR Railroad Underpass is a historic structure located in Cedar Rapids, Iowa, United States.

This kind of structure became more popular in the late 19th century as a railroad bridge because it was more durable than metal truss bridges, and they "projected a refined and sophisticated image.

"[2] It features a semi-circular arch, a beltcourse, coursed-ashlar masonry, stepped wing walls that are flared, a parapet with projecting coping, and an elongated keystone with the date "1887" carved on it.

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