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I would recommend, a) building benchwork high enough to allow access from underneath. b) some sort of hardshell scenery over the tunnel, to allow room for your arms to work. (no solid foam mountains) c) Open frame benchwork, with either "cookie cutter" plywood subroadbed or spline, with homasote on top to form a 4-5 inch roadbed (single track, wider for double). To this add "guardrails " of either heavy cardstock, foam core or 5mm luan plywood about 2 inches high,so that if a derailment occurs, it gets contained to the rails, not the floor. d) if the trackplan will allow for it, rerailers inside tunnels are not a bad idea. Could set a single car that is off the rails back on, before it becomes a bigger problem. Just my [2c]
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