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. [>>>] 
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 article to see how the automatically rendered terrain (3D land surface) in SCARM can be changed by the user. 
Read this tutorial to see how to create custom level crossing with barriers for your track plan, using the figures in SCARM.