The train makers on the Odakyu Line in Japan are pretty smart. When they wanted to make their trains more kid friendly, they simply went out and got kids to redesign them. The result is a big yellow train with clouds, monkeys and what could possibly be a bunny or a pig (check out the pink thing along the bottom left in the pic) on it, and another train that has scenes from around Mt. Fuji. Both look like they were drawn in crayon because, well, they were. These are kids we're talking about. That's probably why the trains were rolled out amidst a shower of bubbles. And probably why the kids weren't involved in the design of the brake system.