The larger the dot, the more enslaved people on board. And if you pause the map and click on a dot, you’ll learn about the ship’s flag—was it British? Portuguese? French?—its origin point ...

The Windrush and Mildmay lines are both subject to severe delays this morning while TfL deal with a trespasser on the tracks ...

SL (Steam Locomotive) runs across your terminal when you type "sl" as you meant to type "ls". It's just a joke command, and not useful at all.