A CSX tie exchanger in Waycross, Georgia, USA. The arm that grabs and moves ties can be seen at the center of the vehicle just above the rails. On either side of it are two of the clamps used to lift the rail. Two more clamps are in corresponding positions on the opposite side of the vehicle.
A tie exchanger (also known as a TKO for Tie Knock Out, or by various combinations of tie exchanger, extractor, replacer, or inserter) is a self-propelled railroad maintenance of way vehicle that removes old railroad ties (also known as sleepers) from tracks and inserts new ones. By using mechanical and hydraulic force, a tie extractor/inserter can replace ties much faster and with more precision than is possible by hand.[1]
The TKO is distinct from the track renewal train, a much more complex machine which replaces the entirety of the rails and ties at once.
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