On our IC stock We have the non first class end, immediately behind the cab, dedicated to cycles/crumple zone, so only the driver allowed in (gee thanks, I guess that’s why we get paid the “big” bucks

).
The other end is first class and the galley behind the cab
(this is also part of the crumple zone, but nobody seems to have noticed). The customer hosts generally make more racket on their phones/wittering on about ‘Selebrity get me outa here etc. than passengers ever do.
But, if I went back and told them to shut up, they’d refuse to make me tea and/or spit into it, so I have to suck it up.
On the railway, one learns to choose one’s battles carefully

.