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LESSONS FROM OTHER CITIES <br /> Alternative rail route (shoofly) during construction <br /> is a large one-time cost, property impact, potential <br /> traffic impact <br /> 2 Trenching and tunnelling are extremely expensive <br /> (PA - $2.4-$4B) <br /> 3 <br /> Tunneling requires going —60' under creeks; <br /> feasibility of getting a permit is questionable <br /> Grade Separation Study <br />