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cut a heavy wall plastic water line (like the kind used by water departments for laying line into subdivisions). in half. bend one half to fit around the roadbed through the tunnel, lay the track in the pipe, then glue the top half of the pipe in place. when something comes off the track in the tunnel, simply take a high pressure airline and some type of plug to go around the airline and fit just inside the tunnel opening. give it a blast of 250 psi air. anything in the tunnel should come out just a shittin and gittin. you could use an old fish net, like the kind used in small boats, to catch the debris as it exits the "tunnel".
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