Reasons to do a helix: -Have multiple levels, plenty of space for one -Would make layout infinitely more interesting -Favorite train has very little stage time with current design Reasons not to do a helix: -Cost of materials, esp extra track -Accessibility for derails -Math sucks I had originally wanted to do a helix then talked myself out of it. Then someone else mentioned it and now I am in full-blown ping pong brain and trying to weigh the options. I have tons of space, and the only train that would be on it would not have autohaulers or anything at all height-restrictive (this Kato E259 Narita Express, six cars: So, a few questions for the pros and those who have built these into their creations.... 1. I am doing the entire layout in Unitrack. I would think Unitrack would be best to use for a helix for reliability, but is that overkill? Could do it in flex for less than half, would need less height clearance with flex on cork than the Unitrack roadbed. 2. Is it easier to track plan for a single or a double track helix, even for a single train in and out of it? I mean, I have the room. Which leads to... 3. I have up to 36" I can use, but I think this train would run fine on 24" which would give me more space to track into and out of a helix. I only need to rise about 2, maybe 2-1/2", but given the extra height for the Unitrack I'm curious about radius recommendations. And finally... 4. Why are so many apprehensive of building these things? What am I missing? It seems pretty simple. Involved planning and tedious construction, sure, but not exactly rocket surgery. When I see sponsored YouTubers talk about what a daunting task building a helix is, it makes me worried I am underestimating things.