Here you can download the updated KATO N-scale Unitrack library for SCARM with added 3D objects for the bumper track end pieces. [>>>] 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 added 3D objects for the bumper track end pieces. [>>>] 
Read this post to see what kind of objects already exists in SCARM and in which libraries to look for them.