Something I have never understood;
Here in Western Canada, a 't' is often changed to a 'd' sound. How come? Example "thirty, forty, water", become thirdy, fordy.....etc.

Mind, as I'm from Yorkshire I can't say too much!
I don't think the New England sound is dying out back home though. I'm still a Faamuh.....faameh? (farmer)
We never seem to put R's in the middle of a word. Same as New England/Boston it seems!.....(Faam again)

I don't know why we write words with R in the middle....never use them, except in the case of something like an arrah.....used with a bow.

Near where we used to live was a village called Scalby. pronounced Scorby. why? I know not. Then of course the famous Worcester! (As is Worcestireshire sauce!!!)
When we all know it's Wuster!