This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
PRR rail section drawing. Superseded File PRR rail section drawing CrossSection of Standard Rail one hundred pounds to the yard as used on the Pennsylvania Railroad in the cite book Willson Frederick Newton Appendix page III Practical engineering drawing and third angle projection org pdf PDF New York London Macmillan Co Willson