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This N Scale set of trucks will need 0.533" x 36" steel axle wheelsets to complete the truck. The truck re-uses the original mounting screws and electrical pickup so make sure the front and rear trucks have the axle isolators on opposite sides of the tender frame and on the same side within each truck respectively. A very light cleanout BY HAND using a Dremel 105 bit in the axle point pockets on the inside of the sideframe will make for a very smooth rolling truck. Care should be taken when gently spreading the truck to insert the axles.