Again this opinion is based on a number of buyers I've worked with and their need to have more privacy and be further away from the tracks. I hope this helps in your decision.
Get the other lot, even if it's more. FYI, the best lots are ones where the "living area" of the home is facing South or West....but some buyers never pay attention to that. I do when I'm showing homes to buyers, though.
FYI, I regularly consult with buyers who are building new homes. I have done many new build homes. If you need help please let me know. I am sure you know that builders typically pay a buyer's agent. I would be willing to work with you for a limited fee if you are interested. (disregard if you already have an agent)
Ask your agent. If you don't have a buyer's agent, get one.
The HomeBuyer's Adovcate
I'm with Gregg and believe there is little future in resale or value of any property that is so close to a RR track/line/station, etc. It's got to be one of the worst possible locations for residential real estate.
Boca Raton-Miami Beach