There are risks for us here though. Just as we've learnt to understand photography's limits in telling us the truth, we must be a bit circumspect about how much one card can ever tell us about the past.
Although perhaps more honestly so than photographs, postcard messages are of course very subjective. While space restrictions encourage people to keep to the facts, the sender will always give us their version of events. We can't be sure but I suspect Dorothy may well have hammed up the jumpiness of the train for her Grandma's enjoyment. The neat address certainly suggests she regained her poise at some point :)
More generally, postcard messages may also encourage us to fall foul of what Susan Sontag called the 'atomizing' of life.
Sontag was wary of photos; seeing them as no more than thin slices of space and time. She felt there was a danger that by relying on photos, people create histories of freestanding moments (or 'particles') rather than remembering life as it is - continuous. I know when I think back to my favourite holidays or childhood, it's often photos which come to mind first rather than memories of the whole experience. The same reservations must apply to postcardese.
But, as Postcardy and Debs explained the other week, if we are wanting the truth it may be best to look to the top right hand corner. Our friend the tilted stamp is back. A clear, undeniable sign that Dorothy loved her grandma.