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I just had to re-lay staging yard tracks that were 28" and 30" I had to pull the 30 out to 30.5 to make sure the passenger cars will clear. I tested with Cab Forwards running past each other, no problem, passenger cars... problem (go figure!!) <br /> <br />2.5" on center is good. I have cheated that with larger radius curves, but always check clearances with long (80'+) passenger cars and any large rigid wheel base locos that you plan to run. <br /> <br />Get an NMRA guage as well to check clearances between track and other obstacles such as posts etc. I usually add at least a half inch to gauge clearance just to be safe. As far as how wide the sub-roadbed has to be, it is up to you. There are spots on my layout where space is tight and track is right at the edge of the roadbed (In hidden staging). In any tracks along the edge of the layout plan how you are going to trim the edge of the layout and cut your sub- roadbed accordingly. I have had to go back later and scarf stuff together along the edges to make a nice fascia after cutting boards off too short.
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