Read this post to see how the track supports can be easily placed under long flex tracks at position by your choice. [>>>] Placing Track Supports Under Long Flex Tracks
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Read this post to see how the track supports can be easily placed under long flex tracks at position by your choice. [>>>] 
This article shows some ideas about how to create your own bridge supporting pillars and railings in SCARM in order to make them looking more realistic in 3D viewing mode.