A screw-threaded counterweight adjustment apparatus is journaled in end journals provided with brackets for attachment to the interior of a railroad crossing gate arm casing preferably by jam-type threaded fittings. A traveler is threaded over an elongated helically threaded rod rotatably mounted in the journals. A guide on one side of the traveler fits in an adjustment slot in the casing and a counterweight supporting rod or pin extends from the guide for attachment and support of the counterweights. The helically threaded rod is manually rotated by a wrench or by a motor to move the traveler and guide longitudinally on the counterweight section of the gate when it is desired to adjust the position of the counterweights.
