Read this tutorial in order to see how to create a roundhouse in your track plan in easy and proper way. [>>>] How To Make a Roundhouse in SCARM
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Read this tutorial in order to see how to create a roundhouse in your track plan in easy and proper way. [>>>] 
Watch the video tutorial #6 about how to quickly create complex SCARM layouts, created and narrated by Ruud Boer. 
Read the article and watch the videos to master in details how to create and edit helices in SCARM by use of curved sectional track pieces. 
Read this tutorial to see how to create custom level crossing with barriers for your track plan, using the figures in SCARM.