The theme of the ride encompasses the big steam locomotives from the 1920s until the 1960s. It features special elements such as turntables and a freefall. "De Beul", which is the largest locomotive ever used by the Dutch national railways is also part of the ride.
Storywise the rides starts out on the attic of grandpa Harry, whose family has worked on the tracks for three generations. After climbing the final stairs visitors take place in the four person cars which takes them around the ride.
"Stalen Monsters" is Dutch for "Steel Monsters"