Why do both parents need to go to the supermarket together?
(Obviously single parents have no choice other than delivery)
This discussion seems to have migrated somewhat from travel in 'quiet' coaches, through children on airplanes to children anywhere where their presence might irritate others. Yes, it can be annoying when children make their presence felt in audible ways, generally the younger they are, the less control a parent has over them doing so. In my view, it's the behaviour of their parents that differentiate between responsible control and allowing /creating an unreasoanble disturbance. Fortunately the majority fall in the former group but regrettably the few that don't seem to create an attitude of some that unless children in their proximity are almost comatose, then their family needs to be served an ASBO. As far as long-distance (and generally long duration) confinement goes, some families may even be in transit between homes. Not every family drives and to be frank, why should they have to commit young innocent children to the additional hazards of road travel.
In 2002 my son went to NZ to work for a few years. On the way out there was on toddler on the way back in 2005, the toddler was nearly school age and there was another baby in arms. The journeys were difficult, but there was no alternative, (is somebody here going to suggest coming back by passenger ship), so how should the family have dealt with it?
The simple fact is that train travel is a public transport mode for the general public. Excepting the few families who really do allow bad behaviour, for whom some censure should be dished out from rail officials, other families should be tolerated by others as much as possible. For those who have a congenital intolerance of noise/smell/etc., of anything child-like, they have many choices:
move to another area of the train
alight and take another train
use another mode of transport (car/taxi/coach/walk)
wear ear defenders/ear plugs/listen to music or any other placating sounds (via earphones of course)
just lump it if the other choices are too much trouble
Life is too short to get that stressed about it. Rather than insisting that the world changes, learn to live with other people.
None of the above denies that there are some selfish, self entitled, self obsessed parent that demand that the rest of the population love the product of their reproductive efforts as much as they do, but to use that as an excuse to treat all families badly is more indicative of themselves than the claimed source of their ire.