Here you can download the updated KATO N-scale Unitrack library for SCARM with the new turntable and access tracks included. [>>>] Updated KATO N Unitrack Library for SCARM
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Here you can download the updated KATO N-scale Unitrack library for SCARM with the new turntable and access tracks included. [>>>] 
Read this tutorial in order to see how to create a roundhouse in your track plan in easy and proper way.