Transportation Cards at WDW

We rode in the nosecone (operating cab 6) of the monorail last weekend and in addition to the usual Monorail card, we got a new one. This one gave some factoids about the ride and claimed it was part of a series of WDW Transportation Cards - there are 18 in all.

I'm intrigued. So we have to figure out what the 18 forms of transport are? And then we have to figure out how to get the cards? We wouldn't have known about this if we hadn't stepped into the nosecone of the monorail. Do we have to do other tricks like this to get the other cards?

Certainly, the bus is one of them. Maybe the Liberty Belle wheelhouse? Personal water craft? Ferries to Fort Wilderness? Boat to the Swan? How could there be 18 varieties??