Bletchleyite
Veteran Member
It generally isn't a problem in Switzerland because they have a lot more slack/padding in their timetabling, meaning that it's relatively rare for those kinds of delays of develop in the first place. If we adopted that same practice on our much more intensively used network then it would mean significantly reduced capacity and extended journey times (at least until we upgraded the network to counter that. So for a very long time...), which would hardly be a good way to attract and retain passengers.
It's possible and has been done in some places (albeit to a bit of whining). The south WCML post COVID timetable is slightly less frequent than before, based on a 2tph pattern (though rather than upping to 12 car for the peaks it's mostly done by peak extras, probably because 8 is easier to platform at Euston and avoiding splitting/joining increases resilience). Similarly the Cross City has been reduced to 4tph from 6 but running everything as double units so capacity isn't lost.