steam

Gill: Where's JR?

Jan: He's off racing a steam train.

Heather: No he's not, his friends are racing a steam train and he is putting up his wife's tent and wrestling with her sleeping bag.

Gill: But what's this steam train thing?

Jan: Well basically, this steam train is going along the track and there are a bunch of people trying to race it to its destination to see if they can get there faster.

Gill: Wow! Do you think the steam train knows?