RoboRally boards.

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Mind The Gap
(source: my own board)

[pdf]

I'm rather pleased with this. I made the board as a present for Owen, a friend who likes both RoboRally and trains. This was my attempt to construct the London Underground in RoboRally form. Every single item on the board serves a purpose or has some meaning, in many cases a bad pun.
I created the green gear element, so that whichever way the green conveyor is moving, you are always turned towards the center of the board. (I should point out that in our house rules the green conveyors do not flip immediately when someone passes through green beam; instead, passing through a beam means that they will flip the following turn. This means that approaching Notting Hill Gate from the north isn't as unpleasant as it seems.)
There are other unusual things. The watery conveyor and a watery gear behave as you would expect: conveying or rotating is as usual; moving off the square requires one extra movement, as usual. The goo is just decoration. The converter symbol can also be treated as decoration, however we thought that having it add one to your movement if you move off that square would be fun.
Good luck trying to work out all of the references and jokes!