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Originally Posted by Easy
I don't think that there were ever any plans to use the Amtrak or Metrolink tracks for HSR. High speed trains will need to use the same platforms all the time so that they can get in and out quickly. And that can't really be coordinated with Metrolink/Amtrak which sit there for fairly long periods. And they can't really give 4 of the Amtrak or Metrolink tracks to HSR and still have enough to run their regular service. And then there are also noise issues which I recall will require HSR to take a slightly different route into LAUS when heading north.
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The run through tracks are supposed to increase Union Station's capacity by 40-50% compared to the current stub end format. This eliminates the long periods of time where Amtrak/Metrolink trains have to dwell at the station. As a result, enough station capacity would be freed up for Union Station to devote four (or more) tracks entirely to high speed trains.
Here are some schematics of what this would look like from alternatives analysis for the Union Station - Anaheim seciton of CAHSR, via the Transit Coalition forum.
Obviously the plans for the CAHSR interface with Union Station haven't been finalized yet(hell, we don't even know for sure that the system will even be built), but this does show that the possibility of re-assigning Amtrak/Metrolink tracks to high speed trains is on the table.