A tour is a reading order, and the order is the argument: which entries, in which sequence, and one line at every stop saying what it changes about the one before. Where you want the complete set instead of a selection — every failure, every evidence grade, every operator — that is what the track record is for, and the topic guides explain the subjects themselves.

Where to start

Two ways into a corpus of more than a thousand entries when you don't yet know what you're looking for.

How it turns out

Routes read from the far end: what the record says happened after the ribbon was cut.

One mechanism, many cities

The same idea followed across borders, so the differences are the argument.

Not a route: your own surroundings