Catbus

The Catbus is a transporting animal bus-looking character in My Neighbor Totoro. He is met by Mei, Satsuki and Totoro. (though Totoro could have known him for years since he already knows to take it to get back to his home under the camper tree).

Film
The Catbus appears on the road of the forest, when Mei, Satsuki and Totoro waiting for Tatsuo Kusakabe's bus to arrive. After the bus speeds a bit too fast and then backs up, it meows with its glowing carlight eyes and smiles like the Cheshire Cat (when he spots the girls), the girls make a random noise in surprise.

Trivia
Katzenbus
 * The Catbus is very similar to the Cheshire Cat in Alice in Wonderland (due to its smile and it having stripes on the same areas).
 * When a passenger wants to go on The Catbus (mostly Totoro and the girls), its sides droop down (not like a normal bus door that slides on the side but in the movie's real bus, the doors are open with a lady standing there due to it being the era of the 50's and it being in Japan they probably didn't have buttons to open the doors like today).
 * In the end credits, you'll see a scene where Mei is drawing the catbus...but adding extra legs and skin windows...
 * The only dialogue you'll get is from the rodents above it, (most buses don't have a voice intercom outside of the bus...maybe in Japan...but not really sure since the bus in the movie didn't say anything so it could be they don't have an intercom or didn't wanna add one, but the Catbus is the only one who has an outside intercom)... it could be the rodents talking or the Catbus.
 * Here's more on this critter: http://en.wikipedia.org/wiki/Catbus