Posted by Dave Loyola [199.27.128.159] on Wednesday, December 07, 2016 at 02:16:06 :
In Reply to: Re: Railroad Trivia pic 3 posted by Kaegi [108.162.246.78] on Tuesday, December 06, 2016 at 16:48:14 :
These are called date nails, and were put into railroad ties to mark the date they were installed.