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<br />7.A <br />Page 35 <br /> <br />. Trench (covered/uncovered) <br />. Tunnel <br /> <br />Group 1- challenges <br />Aerial <br />. Integration with at-grade <br />o Especially for heavy freight cars <br />. Noisy <br />. Safety concern with derailment <br />. Earthquakes (especially with freight cars and hazardous freight) <br />. Any station would be up in the air <br />Open Trench <br />. Connectivity is reduced <br />. Vandalism/ terrorism/ suicide <br />. Maybe fences will be necessary, with visual impact <br />. Flooding <br />. Water table <br />. Large construction right of way impact <br />Covered Trenches <br />. Egress safety, train safety <br />. High cost <br />. Most disruptive for construction <br />Deep Tunnel for HSR <br />. No HSR station <br />. They won! t pay for Caltrain grade separation <br />. Caltrain at-grade! noisy <br />. Expensive: could kill the project <br />HSR Covered Trench J Caltrain Aerial <br />. Separate train infrastructures - hard to change between HSR and Caltrain <br />. Difficult construction <br /> <br />Group 2 - challenges <br />Aerial <br />. Noise <br />. Aesthetics <br />. Accidents (trains can de-rail) <br />At-grade <br />. Take more eminent domain <br />Trench (covered/uncovered) <br />. Exhaust (fumes) <br />. Because of width -7 requires more eminent domain with 4-track option <br />Tunnel <br />. Cost <br />. There won't be a high-speed rail station in Redwood City (could also be an <br />advantage) <br />