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Rick this is why i never hang around hobby shops (stores), the blokes there are employees and most have little real experience at constructing a garden model railway.I can tell you in my area 3; i have 60 m track in 21 m2 and i have had every challenge that you can imagine in this area. It is quite right if you measure with a ruler from the top of the lower rail up 220 mm a bit under 10 " you will have no trouble unless you have some very tall rolling stock. It doesn't matter what the configuration of the under or over pass is.I do have an R2, a couple of them actually on a 4 % gradient and i wish i didn't, the difference between R2 and R3 under the same circumstances is more than you wqould think.I have a couple of American tankers and concrete (cement) mixer and i have more trouble with them than you would know, ie hitting  overheads. I even have goldebn mountain carriages which can only be run in one direction, because on one side they have a stink pipe for the toilet and it is higher than anything else i have. I also have a very large Mallet loco and i use it as a rule of thumb, if it fits everything else should but inreality not quite.Rgds ian
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