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If I understand you correctly, the type of operation you envision for your layout is having a train "zig-zag" along the line, with the train being not the same and the individual scenes completely separated vertically and not connected by track. When the train arrives at the physical end of one section, it triggers the train above. Quite an interesting scenario! The easiest to get a train out of side is to hide it. This could be accomplished by just anything - a row of buildings, inside a tunnel - depending on the scenery of that particular section. The big issue with this concept is the reverse operation, for which you three options <ul style="list-style-type:disc;"> <li>fiddle yard</li> <li>run-around loop</li> <li>return loop</li> </ul> A fiddle yard requires manual interference, i.e. picking up the loco and placing it back on the track on the other end of the train. You may not like it. A run-around loop requires visibility of some sort. A return loop requires a certain width. 2´ would be the absolute minimum for N scale. If you want to have your layout automated, the third option would be the only way to go.
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