Read this QuickTip to see how to select the desired joining place when more than one joining points are available. [>>>] QuickTip: Choosing The Correct Joining Place
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Read this QuickTip to see how to select the desired joining place when more than one joining points are available. [>>>] 
See the video tutorial #7 about how to use the flex tracks in SCARM, created and narrated by Ruud Boer. 
Read this article to see what to do when you are reproducing some track plan in SCARM from a railroad modelling book or magazine and your project in the program does not able to match like the given layout.