gillian gillett 01-10-12 spur
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Grade Separa)on and Rail Alignments
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Benefits of Grade Separa0on
• Improve safety • Enable higher train speeds • Minimize delay to 16th Street Bus Rapid Transit • Incompa0ble train and bus overhead wire systems • Minimize traffic delay and queuing • Prevent neighborhood traffic diversion • Eliminate train horn noise
To create grade separa0on, either the streets or the tracks need to be depressed
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Mission Bay Street Under Tracks
Source: CaHSRA
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16th Street Under Tracks
Source: CaHSRA
Kaiser MOB site
DaggeQ Place Development (400 residen0al units, 46K office)
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16th Street Under Tracks
Source: CaHSRA
Kaiser MOB site
DaggeQ Place
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7th Street Underpass, Oakland
• Inhospitable pedestrian realm • Exacerbates barrier between neighborhoods • Inhibits access to adjacent land uses
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• Reconnect neighborhoods • Improve aesthe0cs • Reduce noise • Enable access to adjacent land uses
Preferred design would depress tracks under street – like a subway
Underground tracks enable poten0ally straighter or shorter route than exis0ng alignment
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Alterna0ve Rail Alignments Considered
Source: SFCTA
West Route • Conflicts with Moscone & SFMOMA • No Mission Bay sta0on (except spur)
East Route • Poten0al conflicts with Mission Bay
building pilings • Relocated Mission Bay sta0on to east
DTX Route • Retain 0ght curve at 7th/Townsend • Mission Bay sta0on remains
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1. Connect to DTX at 4th/Townsend Sta0on? 2. Avoid major sewer infrastructure 3. Avoid structures on pilings 4. During construc0on: • Maintain Caltrain opera0on • Minimize disrup0on to local land uses • Accommodate local circula0on and regional traffic
Constraints on Poten0al Rail Alignments
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• Simplest op0on • May not be physically or structurally
feasible
Op0on 1: Trench in between freeway pilings