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Well, the numbers don't lie.  If you've got 7 feet of vertical distance to get over, and you want to restrict your grade to 3-4%, you're going to need about 200 linear feet of track to cover it.  You have about seventy to eighty feet, so you have another hundred feet plus to find somewhere.  Some ideas:+ You already mentioned helixes.  A single eight foot diameter loop gets you fifty feet or so of length.+ Consider starting your connecting track in a nonobvious place, not at the closest point of connection.  Do you have room for an elevated loop circling around your existing layouts on either side?Also, are you going to have single or double track connecting the layouts?  Single track would be easier, especially with helixes, but especially if you're using track power it could raise some wiring or operating problems.
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