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I’m at the point in teaching my 16-year-old daughter to drive that we’re now out on highways, making the long drives to practice staying in lanes, merging onto expressways, and staying within the speed limit, so we have time to talk a little about things other than watching out for bicyclists and what to do if a squirrel jumps out in front of you (bye, bye squirrel). Lately, we’ve been chatting about TV shows she used to watch when she was little – Teletubbies, Zoboomafoo, and, a perennial favorite, Thomas the Tank Engine. Sir Topham Hatt, the director of the railway, reserves his highest praise for the trains in very unique situations, such as pulling a load of school children up a steep hill, or helping a larger engine push an extremely heavy load of coal. At the conclusion of the episode, he would intone, “You are a Really Useful Engine.”