@vi don't be daft they don't announce it
You get on the train, they lock the doors, get the train up to speed and then a smattering of people goes "hey we're not stoppi- hey does this not stop at [little place]? Are we fast to [middle-sized place]? Are we fast to [large place]? Wait fuck are we fast to London now???"
And then everyone grumbles and sighs about how they're going to miss dinner now and fuck's sake tut tut.