Minimum required spacing for adequate clearance, curves and/or straights, depends on what you run (O27, scale, etc.), or what you may buy and run in the future. A little more information will help.
Or if you want a ton of good info......
http://cs.trains.com/trccs/search/SearchResults.aspx?q=track+spacing+AND+sectionid%3a95&o=Relevance
Jack
IF IT WON'T COME LOOSE BY TAPPING ON IT, DON'T TRY TO FORCE IT. USE A BIGGER HAMMER.
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