Usage SA3 coupler
other countries extensive usage
finland, rail transport in finland
mongolia, rail transport in mongolia
iraq, iraqi republic railways
turkey, rail transport in turkey
mauritania railway operated société nationale industrielle et minière
cameroon, camrail
gabon, trans-gabon railway (called willison coupler)
some usage
sweden & norway (malmbanan/ofotbanen); used exclusively heavy iron-ore trains.
australia; miniature sa3 used on sugarcane tramways , underground colliery railways.
slovakia (uzhhorod–košice broad-gauge track); heavy iron-ore transports ukraine.
poland (broad gauge metallurgy line); longest broad gauge railway line in poland. used freight traffic, iron ore , coal.
united states willson coupler used in mining , tunneling railroads.
^ http://www.irwincar.com/couplers.php
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