Near Washington and Santa Rita the automobile traffic on Alma may create a more annoying noise than the train. Your closest train crossing (and thus horn) would be Churchill. Both of the homes you've referenced are partially sheltered from line of sight noise coming from Alma by the neighboring houses.
The homes are in a very nice neighborhood. As you've surely noticed a home located a block away from Alma commands a very good price. Stand in the backyard during the day and listen to the automobile traffic. If it doesn't bother you, you and others would probably be quite happy with the location.
Newer homes are tending to be larger and better sound proofed. Your neighbors are likely to provide even more shelter from the noise in the future. Long term you will likely find those two addresses even less affected by the nearby train and traffic.
An unknown for the future is the high speed rail. Elevated crossings will probably eliminate the horn but who knows what the HSR authority is going to do.
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As you mentioned, there are plenty of homes quite close to the train tracks, and for those, you try to look for those that don't have direct views of the train tracks. You'll still get a train track proximity discount for those who can live with it. There are also ways to mitigate the noise, with triple-pane windows for example. That allows some townhomes to be built right next to train tracks and still sell for $1M+.