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If your tunnel mouth is on a straight track there should be no clearance problems, but be VERY careful if the approach and exit are on curves, as some rolling stock and very large locomotives have surprisingly large overhangs. Before you finally build the tunnel mouth into your scenery, make sure that there is sufficient clearance on the inside AND the outside of each track. Some long modern coaches and wagons take up a lot of sideways room on shorter radius curves!
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