"A" is for "All aboard" and this is critical if you are a small blue tank engine with two passenger carriages. It's also important if you are the not-so-fat-controller coordinating the daily choo-choo schedule. Sometimes I wish I was three again - usually on Monday mornings when I read the emails that the boss sent me over the weekend. The biggest job my son has every day is to make sure that Thomas rescues/is rescued when the tunnel/bridge/viaduct/station/crane collapses/burns/wobbles or is run into by a ship.
Quite a task really and one that usually can consume an entire day.
I can feel a train set coming on.