Titled The Iron Horse, the game is described thusly:

Use your lightning-fast reflexes as you build classic trains in a beautiful widescreen game play experience. It's easy at first but as each car gets added your train goes a little faster, further testing your skills and building the suspense. The longer the train gets, the more points you'll earn.

The Iron Horse is currently only available for the iPad, but iPhone and iPod Touch versions are "coming shortly." The game costs $2.99.