Kato 2-143 HO Unitrack Code 83 Uncoupler Track 123mm S123U 2pcs New Kato HO Scale Unitrack Code 83 Uncoupler Track set includes two 123mm (4 7/8") straight track sections designed for use with Magne-Matic couplers. These precision railroad model tracks feature realistic grey ballast and nickel silver rails, providing a reliable magnetic uncoupling solution for your HO gauge layout. The S123U track sections are engineered for smooth operation and easy integration into existing Unitrack systems, making them an essential addition for automated switching and yard operations. Measurements: • Length: 123mm (4 7/8") per piece