First, because the train is set to start running in a matter of weeks, I would advise you to wait until it is actually doing 30 trips a day. Listen to the noise, consider the safety issues that come along with living near tracks, and keep in mind that although there will be no horn at the intersection directly next to Silvercrest, I believe there will be one at Cal State, and it will likely be loud.
I was formerly of the opinion that houses near Sprinter would be far less desireable because of the Sprinter horn. I have heard it a few times now, and I have to say I’m changing my mind. It is not the typical loud freight train horn we’re used to hearing. It is a much quieter horn, on the order of a little Japanese car horn…not even as loud as a full-sized car horn.
Unless there is some future decision that causes the transit authorities to upgrade to a louder horn (a major accident, perhaps?), I think the residents near the Sprinter should be OK. I still wouldn’t want to be right up against the tracks, but a couple roads in should be just fine.