This is a very difficult question to answer. If you, as a buyer, have a sensativity to noise or are concerned that the rental value of your unit would be compromised, I would suggest buying a unit as far away from it as possible.
Happy New Year.
Rich Bennett, Realtor
Zephyr Real Estate
Broker Associate, Paragon Real Estate Group CA DRE 01844627
All data from sources deemed reliable but subject to errors and omissions, and not warranted.
Also having a new station close by could also reduce your homeowners insurance as response times are quicker so there's a better chance for less damage. It's something you have to ask about though they wont automatically lower it.