Interesting video about some of the southern RR changing the gauge in 36 hours.
https://www.youtube.com/watch?v=4v81Gwu6BTE
The Ohio & Mississippi converted from broad 6 foot gauge to standard gauge in July 1871.
http://cincyrails.com/files/FromTheOhioToTheMississippi.pdf
Page 33 has the details
Never too old to have a happy childhood!
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