In Hawkins novel, the protagonist Rachel (Emily Blunt) commutes daily from Ashbury to Euston, London.
But in the movie, Rachel boards a train in New Yorks suburbs heading to Manhattan.
She also told EWthat setting the film in London wasnt even on the table.

Credit: Jessica Miglio
The book had not come out [when I was working on the screenplay], Wilson told EW.
This is an American film, and that was it.
PerhapsThe Guardians Stuart Jeffries sums up the most prominent complaint best.
Transatlantic crossings wash off the grub and bring up sheen, he writes.
Americans cant do dismal quite like the British.
Read some disgruntled British fans outcries below:
https://twitter.com/FlippinGreatGal/status/778613100618608640