I've lived in NWT for 13 years now and SINCE I'M NOT SELLING MY HOUSE, you can be assured my answer is as honest (albeit a few years late) as possible.
Your question about railway noise: NWT spans several blocks and borders trains like the rest of Olathe. Good news, the further on the periphery, the less noisier it is and for the entire time Ive lived here the only noisy train is at night after ~2:00am and just makes track noise without train horn as part of regulatory and likely transport policy.
The singularly loudest disruption here is a weekly tornado siren test Wednesdays at 1:00PM, it can stir a lawyer out of her coffin, then there is a bi-weekly Chinook with the KS Natl Guard that includes us in their afternoon flight path.
Once a week, mid week, a premium private jet whisks over the area after midnight on his regular Bogota run.
But the most annoying noise, is by far, the newspaper delivery van arriving around 4:00 AM M-F and about 2:00AM Saturdays, the rusted out old Ford van is more rust than van and his muffler had to be intentionally engineered to be so ineffective and resoundingly noisy. The van drives slower than a ferrel molester on the first day of school letting everyone know that we live here with him and not the other way around. The same damn van, same damn noise and it has to be more than accidental.
OH, and only 4 reported crimes in the last 13 years including an ID theft victim whose online shopping account was looted but the police report had to list her address so she's listed as an ID theft victim in our neighborhood despite her credit card and personal life being ripped off from some Tibetan web server.
This is literally, one the safest neighborhoods in the world especially considering it is a ungated community of a few hundred homes and the other three crimes was a domestic dispute from a wife that beat her husband because he wouldn't shut up (true story) and juveniles who burglarized their rival neighbors car over something that started on FaceBook. The car burglary victims struck back by revendalizing the burglarizing neighbors rounding out the fourth and last crime.
So, family friendly, yeah, in fact its literally quiet and boring here, so boring that even Panda Bear Porno holds more interest than spending a month here.