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<br />7.A <br />Page 22 <br /> <br />. Less expensive and disruptive <br />At-grade <br />. 4D segment: less expensive <br />Trench (covered/uncovered) <br />. Minimal sound (sideways) <br />. No visuals <br />. Take advantage of the land on top ~ recover land (green space) <br />. Stacked covered trench: less space, less disruption, less right of way ~ <br />double stack trench <br /> <br />Tunnel <br />. Less property taken (less eminent domain) <br />. Noise minimized <br />. Aesthetics <br />. There won't be a high-speed rail station in Redwood City (also listed as a <br />challenge) <br /> <br />Group 3 - advantages <br />Deep Tunnel <br />. Could dig anywhere, no right of way issues <br />. Similar to BART in Berkeley; or BART under the Bay <br />. Actually a bore; don't have to do construction. Removes issues of stitching <br />lines together <br />. Neighborhoods, alphabet streets, houses, small businesses (right of way is <br />only 60 feet) ~ cannot have impacts and the Tunnel option alleviates this <br />. No advantages to elevated tracks <br />. Deep Tunnel is most advantageous <br />Trench (covered/uncovered) <br />. Allows station in Redwood City <br />. Allows electrification of Caltrain <br />. Eliminates grade separation <br />o Safety concern with grade separation <br /> <br />Group 4 - advantages <br />Aerial <br /> <br />. Traffic flow <br />. Bike path possible under track' <br />o What is the reality of that option? <br />. Better rider experience <br />. Keeps option open for a train station in Redwood City <br />. Better movement across the right of way <br />At-grade <br />. Lowest cost option? <br />o Listed on sheet as lowest? <br />. Right now not an option on 4C section <br />. No changes to Caltrain section <br />