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Private company

Rock and Rail LLC

Railroad in Colorado

Rock and Rail (reporting mark RRRR) is a short line railroad operating in southern Colorado that is currently a subsidiary of Martin Marietta Materials. The company began operations in July 1988.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

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RRRR though the Royal Gorge
Photo: Jessica Hall, CC BY-SA 4.0, via Wikimedia Commons3

Rock and Rail (reporting mark RRRR) is a short line railroad operating in southern Colorado that is currently a subsidiary of Martin Marietta Materials. The company began operations in July 1988.2

Sources

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