This fencing consists of folded single strand links with ends joined in center by double wrapping wire to form a two point barb.
Each link is connected to the next to form a flexible chain. This is a variation of machine patent 292,408, Jan. 22,...
Railroads; Railroad construction & maintenance; Cast ironwork
To join train cars together, the cast iron pin was inserted into the removable oblong link and a permanently attached coupler. Switchmen worked between railroad cars to complete the dangerous task of linking them.