The entry of a child into any situation changes the whole situation.
The bottomless bitter misery of childhood: how little even now it is understood. Probably no adult misery can be compared with a child's despair.
Trains induce such terrible anxiety. They image the possibility of total and irrevocable failure. They are also dirty, rackety, packed with strangers, an object lesson in the foul contingency of life: the talkative fellow-traveller, the possibility of children.
Probably no adult misery can be compared with a child's despair.