I'm building a double track mainline using O82 and O72 Fastrack curves.
What are the recomended clearances and spacing for the tracks?
Minimum height and width for a single track tunnel?
Minimum height and width for a double track tunnel?
Minimum height clearance for a underpass?
Inside track spacing width for a MTH O 2- Track Steel Arch Bridge?
Thanks
Jim Miller
Havre de Grace Maryland
Replies sorted oldest to newest
Jim,
I'll tackle the first question. A standard 072 & 084 Fastrack mainline separated using 2 switches and a 1.37" piece will yield a 6" center rail to center rail spacing. Depending on your rolling stock, that should leave enough room for clearance on curves.
The other minimum height & clearance questions can be answered by folks with experience with over passes and bridges.
Bruce
If you use turnouts to connect the 084 and 072, you will have no choice to use 6" between the track.
Fastrack is designed for 6" spacing between tracks. That is why the diameters of the curves come in 12" increments and the spacing when using 2 switches in a crossover is 6". If you can get 6" high off the track, that is optimal. In a pinch 5" will usually work, depending on the height of your highest equipment of course.
Thanks to everyone that responded and offered suggestions.
Jim Miller
I have double-stack cars that are about 5 1/4" high from the rails, so I'd recommend the previously mentioned 6" clearance. 
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