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Originally Posted by mattropolis
Why does the whole rail yard need to be raised? Is that necessary for the trains to be able to go over the new viaduct?
If it's not necessary, then it seems to needlessly increase the cost.
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From the EIR, the 2 reasons are to accommodate HSR’s elevated platforms and Caltrans clearance standards.
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All lead tracks through the throat, as well as the station tracks they serve (new Tracks 3 through 14, respectively), would be raised to a maximum of 15 feet at an approximate 0.7 percent maximum grade to accommodate elevated platforms.
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In the full build-out condition, the rail yard would include 14 tracks similar to the existing condition. Tracks 1 and 2 serving the Gold Line would remain at the current elevation. Tracks 3 through 14 would be raised by approximately 15 feet and constructed at a 0.0 percent (level) grade to meet the required run-through track clearances over the El Monte Busway and US-101 (16.5 feet minimum clearance per Caltrans standards).
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