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Depending on what you intend to do with the track on your layout, you may wi***o consider what many people are using, which is flex track on a cork or similar roadbed. It takes longer to lay down, but also allows trains to run more smoothly when done properly. If you are planning to change your layout frequently, the "roadbed" track such as EZ track can be an attractive option. I picked up a Kato Unitrack set recently because it was my intention to set it up and take it down frequently, which is not possible with flex track and cork. If you have a Local hobby shop nearby, you can ask them about the various options and the benefits and detriments of each. They should be willing to work with you to show you how each one works and how each is installed. Of course, they would be even more likely to do so if you support them with your purchases (or at least some of your purchases). <br /> <br />As for the radius of the track, yes there are a lot of limitations to using 18" radius track. Depending on the type of train you intend to run, you may either not be able to run it, or you may find that the train looks very strange running on 18" radius. Larger locomotives and many passenger cars look very out-of-place on tight radius turns, if they run on them at all. Generally, the larger the radius of the turn, the more realistic the appearance will be, at least until you get up to about 40". After that, you pretty much are true to scale for any turn. As for what you can run on 18" radius, smaller locomotives and rolling stock seems to be the answer. Most diesel switchers and small freight locomotives will work OK on 18" radius (e.g. GP35, GP 40, etc., SW7, F3, F7 and the like) as well as small steam locomotives (4-6-0, 4-6-2, 0-6-0, etc.) Most articulated steam locomotives will not work, or at least will not work well. I hope this info helps. <br /> <br />Opinions vary, but the information that people give on this forum seems to be well founded on personal experiences and is very helpful when you have questions. You came to the right place to find your answer! Happy railroading.
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