Phnom Krom was at the southern end of the Phnom Krom railway, a narrow-gauge French colonial railway that was most likely constructed to take stone quarried on the now defunct quarries on Phnom Krom to Siem Reap.
It is impossible to speculate when the railway was constructed, but most likely it would have between around 1890 (when the French were, among other things, undertaking extensive construction in Phnom Penh which also included the use of narrow gauge railways) and perhaps as late as the 1920s, when work on the Grand Hotel D'Angkor was being undertaken (a project which would have required large quantities of building materials).
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